did you factor in pieces for the top for bracing or are you going to use a different material for that. a piece of acrylic that long will bow and bend a lot.
as far as the film/clear bra goes, i havent see an after market film that doesnt distort the image. it will usually give it a slight wavy/blurred look. no big deal if it's tint or solid color behind it but for clear transparency it sucks. like always getting a slightly out of focus picture. makes you want to squint to sharpen up the lines but it never works.
If you put off what you can do today until tomorrow it will never get done cause tomorrow never comes. It's always today.