hey diskreet just wanted to say thanks for the idea on this! i did it a few weeks ago and i love it! ive been posting my pics all over the forum like crazy cuz im hella proud of it! lol...but anyways i just wanted to post in here since you guys are talking about hiding the hinges and ^about the sagging issue.
first heres the pics
we put all the pieces in the car, uncarpetted, then attached the rear middle section to each side section with a bracket. like this
that will take care of a lot of the sagging. in fact i was laying in my trunk for quite a few hours last weekend because i was installing trunk shocks and it held fine...didn't sag any because of my weight.
then instead of carpetting each piece of the floor, once i had the brackets^ installed, i carpetted the entire floor as one. then, all you have to do it take a razor blade and slit where it should open for the spare tire access. the hinges will be hidden completely - no need to expose them.
although, i don't have the spare in the space provided. i use it to put my school books and stuff that i don't want rolling around in the trunk. im going to cut and carpet another piece of wood in order to make a back wall to the hidden area so nothing goes too far back that i can't reach it.