Tips to FG the whole trunk?

so ive done one project... FG one sub in each corner of my car (rx8)... i've recently been craving to do another project... now i wanna go big.. i wanna do my whole trunk... my only concern is the size of everything... the boxes ive made (pictured) just BARELY fit.. in order to get them in my trunk you have to angle it a certain way.. and its a tight fit.. and i dont wanna build this whole FG box and not be able to fit it in my trunk.. i know im going to have to create several pieces... also how do i make them flow like its one giant piece?

Try building a model out of cardboard that will resemble your final idea and test fit w/ that. That's what I do when making my boxes to ensure that they fit into trunks properly. Also check to see if that back seat comes out. That can often be a larger and easier to pull in/out of the trunk. And if that doesn't work then I'm gonna have to go w/ jesse on the idea of one large box built in the trunk. Piecing a fg enclosure together in a trunk while keeping it properly sealed and looking good will be dificult, very difficult

im just finishing up a trunk setup in a corvette, and i found it easiest to make it mostly out of MDF. you'll definately end up with at least one seam in your design (i had 3 considering there are 3 amp racks), but another things that helps is iff you use a cover for your trunk buildup. what i did was built a false floor with some glass trim that went up to the trunk trim( it's a corvette, so the hatch made for a decent amount of open space between the weather stripping and the straight edged MDF). It looks alright right now (hasnt been sueded yet so we'll see how it looks finished later), but if you can get in there and make a good single piece Fiberglass trunk covering (in other words if you can make a single piece and still be able to pull it out of the car when it's done) then i'd say to do that.2000 Chevrolet S10

Premier DEH-P860MP

JL Audio XR650-CSi components

Boston 4x6 splits

JL Audio 10W3v2

Alpine MRP-M350

Clarion APA-4162

do the back seats fold down?  What type piece are you looking to make?  And don't forget, you can always take the weatherstripping off for a few more mm.