Thanks for the reply. Like I said i'm extremely new to this and could use any help I can get. Although, I don't think you fully understand what I am trying to do, and I guess that partly because I didn't fully explain it.
The lot is part of a marina and restaurant that my uncle owns. The idea is to draw some attention to the marina with the hopes of picking up business a bit. The screen would be viewable from the lot, the balcony for the restaurant, and even from the boats on the harbor. With the prices dropping for projection equipment, one could set up a screen and projector for VERY cheap. The screen would not go up more than 3 days a week for about 4 months a year (weather permitting). Of course the screen would not be going up on windy days, and you would be surprised by the amount of wind these screens can withstand.
As far as the line of sight from people's vehicles. There are several companies that show movies in parking lots with no ramps for the vehicles. This is one good example:
As far as having ample space for concession stands, ticket booth, and "Playground"?, The entire property is enormous. There is actually a perfect area by the entrance where a simple ticket booth could be easily set up (that's if we even charge entry). The concession stand would not be necessary because any "concession" money could easily be made if the business in the restaurant picks up. Also, I would be going with rear projection. There is a big space behind where I plan to put the projector.
As far as the projector, 35mm is not even an option because its just outdated. I wont be needing a D-cinema projector especially if I'm not charging entry. There are several distributors that charge a flat rate for showing movies and they will send you the movie in any format, not just prints or hard disks anymore (dvd, Blu-ray). The estimated costs you listed are not anywhere near reality. Maybe a couple of years ago you would be right but nowadays this is equipment is getting very cheap. I'm also going with a smaller size for a screen which would not necessitate an extremely strong projector.
There's definitely a lot of things I need to consider more in depth but I have time on my side and this is only the beginning stages of an idea. I posted the idea here, not as a full business plan but just some food for thought, and maybe something that could really help my uncles business. Please let me know if you have any other suggestions.