noseoil wrote:I think the ""best" option is the one that costs the least & still gives a good functional panel. Since the plywood is just a frame (the skeleton for your build), find the flattest, cheapest type & join the edges for the size you need.
I just used wood dowel pins & glue to hold mine together long enough for the inner skin to actually glue & hold it in place. A pin at each joint in the frame is plenty. A butt joint in plywood with glue & a dowel will make a cabinet maker cringe, but it's the skin that locks it in place the way an OSB panel locks a wall together in home building once it's nailed to the 2x4's. Once a skin is glued in place, you'll be surprised at how light & strong the panel is. Prior to skinning, be careful moving it around as it can break at a joint from its own weight, if you aren't careful. Just my $0.02 worth...
Noseoil, thanks for the word of the wise/thrifty. I am debating getting a panel and doing a skeleton cut out rather than any stick framing for the side. It just seems that stick building isn't much lighter if you skeleton out the ply enough. I also would have to either buy the wood or travel 2.5 hrs to my dad to get more lumber for free. I understand the sum of parts strength that you pointed out. That is very important to consider as well. Overbuilding is habit for me so I want to make it right not clumsy and heavy.
Thank you!
skinnedknuckles wrote:Jeremy,
I used 4x8 sheets of marine grade plywood to make my sides. At 9' 5" my seam is at the rear in the galley. That way ,once you put the cabinets in, the seam is strengthened. I made a spline out of 7 ply 1/4 " plywood epoxied into a groove cut in with my router. It should be plenty strong enough. If you were to look at it you could not see it as I also have a 3/4" plywood with holes cut in for lightening and then I covered it with 1/8" Baltic birch plywood. When gluing the spline and plywood together I used 2" x 2" angle iron for a backer to clamp to that made sure that the whole thing stayed flat and straps to pull it together ( not tightened too tight but just enough so things stayed flat and together )
Have fun
Paul
Paul, I am actually aiming for a 5 foot tall camper rather than 4. Both myself and the wife are a tall upper body so the height is important for us to be able to sit up rather than slouch. I hear of some people using MDO but my only concern about that is the formaldehyde in the panel that can be let off in machining and over time. I am really leaning towards the 5x10 3/4" ACX plywood that Menards has to special order but I am tempted to see if Marling lumber has any available at a better price. I just need to call or stop in this week. I have Thursday off again so I want to work more on the project so I would like to have it or pick it up by then. I would still need join on a piece of the drop to finish out the rear curve but one small spice is a cake walk as compared to 2 5 foot splices using 4x8 sheets.
The other option is buying 3 4x8 sheets and doing cutouts like shown but that just seems like overkill on the labor side of things. So many areas to go wrong. Gah!

decisions decisions!
Thanks Paul! We should meet up some time and show off our builds (maybe as I progress a little further as mine is pretty boring right now)