design change, need ideas/advice

Well I have changed the interior layout of the camper, yet no pics to show. Here is my problem, (I have very little wood working skills) hence this project to learn. On the Baja benroy door as it relates to what I want to do......... I am going to have about 4 areas of the side walls that will fold down, screened behind the fold down doors. So picture the door folding down vs swinging out.
1. Whats the best type of hinge to use? I am thinkin piano since it will be at the bottom
2 In order to help create a seal when closed would T molding work for the three sides of the fold downs?
3. To lock the fold downs at the top do you think a cam lock would work? other ideas? I would need something to pull it tight to be water proof.
Hope this makes sense.
thx
1. Whats the best type of hinge to use? I am thinkin piano since it will be at the bottom
2 In order to help create a seal when closed would T molding work for the three sides of the fold downs?
3. To lock the fold downs at the top do you think a cam lock would work? other ideas? I would need something to pull it tight to be water proof.
Hope this makes sense.
thx