Congrats. This is a huge step and a true leap of faith! One thing that hit me off the bat was you said you have 80 animatronics and you can fit all of them and your show in just 7 trailers???
You have already leased or bought your space? I'm assuming it's already sprinklered?
Its going to take time to really build up the layers, but don't go everboard with the finer details. Sure, it looks great for photos but your guests will never see 90%+ of any of that stuff. Make your scares count and enought cool detail to sell it and distract from the scare.