Photos of the Colussus megaplex are in this book: "Palaces of the Night" by John Lindsay at:
http://tinyurl.com/yeht4f
Designers of Colussus megaplex:
http://www.norrlimited.com/sports_recreation4.asp
Cinemateer, your ethos is right in line with my thinking when you say: "The reason for unconventional thinking in this case is to create a unique atmosphere for patrons- something completely different from the standard shoe box design. Different is profitable, so I believe anything that keeps customers coming to theaters is worth at least looking into. Any reason to make it an experience in itself is a good reason IMHO..." While I do not believe the social future of the cinemas is rosy, I do agree that for the present, making a cinema an "experience" is vital to being competitive! The final chapter of the recent noted book "Cinema Treasures" by Ross Melnick, does show a slight trend in the direction of making 'movie palaces' of the 21st century. If this is your intent, more power to you!
As to using a circular shell design with traditional rectangular auditoria inside, why not? You can get approval for most any exterior that the authorities think will stand up to the elements and not be a hazard to aircraft. In this regard, by all means, let your imagination soar! As has been said of the palaces: "The show starts on the sidewalk" -- or in our day, from whatever can be seen from the feeder highway. The main thing here is to KNOW the ins and outs of the vital interior spaces: Sight Lines, Acoustics, Traffic Flow, Climate Control, Projection Standards and Stagecraft (if there are to be workable stages), Adequate seating and compliance with the recent court decision re wheelchair patrons under the Americans With Disabilities act, Fire Code requirements as they are interpreted in the locality in question, and, of course, the basics such as structural, weather proofing, HVAC, Electrical, etc, etc!
If your thinking is really hypothetical, the nuts and bolts won't matter now; but if you are actually looking at starting in a few years, there is a load of research you have to do yet. Start right here by reading through the relevant Archives of the Forums as well as the FAQs! You will get a good grounding in the day-to-day problems and solutions of operation. If you are a tyro, then by all means apprentice at a local cinema to learn the ropes, which no one book can adequately prepare you for.
Projection looks easier than it really is (as do most things) but the test of adequate "booth" space is how it performs when things go WRONG, not just when you push the Start button. If you have never done a make-up for a platter when the reels arrive nminutes before the scheduled start, and some are wound wrong or mislabeled, you will wish to heaven that the room was designed with you in mind! We can sit back and speculate about how to increase efficiencies, but until it is a hot summer night with no adequate cooling in the "booth", and you and another sweaty guy are back to sticky back desperately trying to figure out why the platters have stopped for the fifth time, it may be difficult to appreciate the bottom line of projection.
You say you will go "all digital" to escape nasty film problems? Well, look before you leap when they sell it as "Foolproof," because as the old saying goes: 'Nothing Can Go Wrong", wrong, wrong ....! With mechanisms, something will always go wrong, and only experience will help you design for times of failure, rather than only for smooth times of success!
Yes, you may be able to reduce the total number of lavatory rooms by making just a couple of big ones, but that might provide enough space for miscreants to congregate in what amounts to a large 'echo chamber', and you don't want that! Policing large cinemas has become a problem in many areas, so it is a delicate line to walk between having greater amenities for the good patrons, versus providing hang-outs for dangerous types in difficult-to-supervise places. I wish I could tell you that there is a magic formula for such determinations, but there simply isn't. Traditional real estate wisdom says to devote as little square footage to non-immediate profit producing areas as possible, such as lavatories, projection rooms, and service rooms, but this has produced some of the less successful theatres/cinemas known. It sounds as though you have good judgement, and that is better than any penny-pinching, minimalist 'square foot ratio' found in any book.
Yes, there are precidents of somewhat circular buildings, but few of them are efficient or cost effective as to USEABLE space, but if it is only to be a cosmetic shell (and you have the money to squander on such cosmetics) by all means make it so, and then capitalize on that motif with large ceiling domes in the round, quarterspherical dining niches, scalloped cornices and the like, etc. A revolving door would repeat the circular idea, and some of them are now motorized and made big enough for wheel chairs. A ticket room that projects from the curved facade like a large bubble? Why not, IF you can figure out how to keep it environmentally sound in sun as well as snow without spending a fortune on heating and cooling.
If you are in ernest, then there is a plethora of books on the subject, from "American Theatres Of Today" (1930), to the latest titles listed on Amazon.com under Motion Picture Theatres, Theatre Architecture, and related topics. If you can visit the Library of Congress for a few day's reading, you will find over 100 titles on the subject, such as "Proscenium Sight Lines and Construction", long out of print, but still pertinant to designers of today! The "Concession Stand" here lists some helpful titles, and the BOOK SHOP at
www.historictheatres.org lists others, so you have your reading cut out for you!
Best Wishes, Jim Rankin, member Theatre Historical Society since 1976