Question on bunk construction...

First project on the new (old) camper. I searched for this several ways - I'm a bit overwhelmed with the answers, but can't find the dimensions I'm looking for. I know somebody out there has the experience to answer this.
Camper has a bunk piece I need to replace. It is in two sections - 76x27 and 76x16 with a piano hinge down the middle to fold. It rests on a full-length angle bracket. It's that thing across the middle of the photo below ... the 76x16 piece is completely missing and the 3/4" has a lovely set of water marks right in the middle.
The current piece is 3/4" plywood with a 1x4 strip across the front. Heavier than a ... well, it would be easiest to throw down another piece of 3/4", but I'd like to build it lighter. Going through the forums and design plans, I see 2x2 bunk frames and plywood with 1by or 2by all around the bottom - but I don't want to add to the thickness if possible; I just want to be able to lift it by myself.
If I make a frame and slats of 3/4" hardwood, how many will I need to keep it stable at that width? 1/8" plywood okay or do I need something like 3/8" on top? There will be two children up there and I'd like it to last until they fly the coop.
Thanks so much for all the info and experience you guys share
Camper has a bunk piece I need to replace. It is in two sections - 76x27 and 76x16 with a piano hinge down the middle to fold. It rests on a full-length angle bracket. It's that thing across the middle of the photo below ... the 76x16 piece is completely missing and the 3/4" has a lovely set of water marks right in the middle.
The current piece is 3/4" plywood with a 1x4 strip across the front. Heavier than a ... well, it would be easiest to throw down another piece of 3/4", but I'd like to build it lighter. Going through the forums and design plans, I see 2x2 bunk frames and plywood with 1by or 2by all around the bottom - but I don't want to add to the thickness if possible; I just want to be able to lift it by myself.
If I make a frame and slats of 3/4" hardwood, how many will I need to keep it stable at that width? 1/8" plywood okay or do I need something like 3/8" on top? There will be two children up there and I'd like it to last until they fly the coop.
Thanks so much for all the info and experience you guys share
