Alright, so for now I'm kind of scrapping the Roof Top Tent idea, and going with something a little more... affordable.
I went out to the truck, took some measurements, (eyeballed a few) and put together a mental plan of how I want to build it. I drew up a fairly quick (without drawing to scale) plan for a sleeping platform.
At first I was thinking of cross-bed supports and a tri-fold plywood platform that would be hinged in thirds, and laid across the supports length wise, creating a supported sleeping platform. I quickly realized that if I were to do it that way and still want to stow the "bed" in the truck, then my sleeping platform would only be 5' long. Too short for me.
The plan that I came up with, once put on paper, seems pretty slick. In theory, it should work out well and only use one 10' 1x8 and one sheet of plywood... but knowing me, I've probably slipped up somewhere and it will be a disaster.
On with the plans and my idea.
Keeping the bed above the wheel wells, we're dealing with a 57" wide sleeping platform (sweet!). Using one sheet of plywood, I'll be able to make a 6' long sleeping platform (you could make it to the end of the tailgate if you wanted, but I don't need it that long and extra plywood will come into play later).
Materials I've decided on using for this will be:
(1) 10' 1x8
(1) 4x8' 5/8" plywood (I don't see a need to go with 3/4, even with my girlfriend and I in the back... heh..heh...)
(2) 57" 1x8 cross supports (in the cutout bed pockets)
(2) 57x24" plywood leafs to make up the "in-bed" platform
(1) 48x24" plywood leaf to make up the foot/tailgate end of the platform
Remaining plywood to be used as hinged supports for the tailgate platform, and the middle of the 1x8's.
The plan below isn't drawn to scale, unfortunately. Piece "C" will overlap the 1x8 by about 3". There will be a support under the middle of the 1x8, and drop pins through the plywood into the 1x8 to prevent the leaf from sliding off the tailgate.
(I may not need to use the front most 1x8... seems pointless to me actually, and would also only require an 8' 1x8 instead of 10')
The plan says 3/4" plywood, but I've decided to save even more moola... if possible.
There will be an air mattress on top, to save on space. A double mattress from Canadian Tire will be 54"x74", so it will have to squeeze a half inch on either side, to get by the tailgate opening (minor).
Whatchu guys think?