joining four walls

Hello TNTTers,
I have a build started, it is a 5x10x5 Rimple, no galley: http://tnttt.com/viewtopic.php?f=50&t=64888
Question for anyone with experience: I am planning on having rear and front ply walls. If you go to the link to my build you will see the top curves of the side walls have a 19" radius. So I want to have a front and rear walls of 3/4 inch ply (same as sidewalls) that goes up 41 inches. I have been searching the site, but can't find advice/examples on how best to join the sidewalls to the rear and front walls.
Any help appreciated!
Mariann
I have a build started, it is a 5x10x5 Rimple, no galley: http://tnttt.com/viewtopic.php?f=50&t=64888
Question for anyone with experience: I am planning on having rear and front ply walls. If you go to the link to my build you will see the top curves of the side walls have a 19" radius. So I want to have a front and rear walls of 3/4 inch ply (same as sidewalls) that goes up 41 inches. I have been searching the site, but can't find advice/examples on how best to join the sidewalls to the rear and front walls.
Any help appreciated!
Mariann