If the box is already built, you can hang it of a couple of pieces of angle iron via clamps. Get it right where you want it and clamp it all down...
Mmd, Thanks for the response. I'm sorry your drawing is not showing up for me. (Thanks to big brother, I suspect.) Someday, If big brother ever...
Mmd, You wrote me sometime back about perspective drawings. (Thank you very much for that info) Is there a place on the web I could see your...
How about stitch and glue? The Epoxy fillets with glass tape are in effect stringers.
Ralph Stanley, of Southwest Harbor, ME. Designs and builds nice lobster boats. Last one they were building looked quite fast (on the loft floor)
I believe John Brooks, of Brooklin, ME built a plywood lapstrake version a couple of years ago. You can reach him at brooksboats@hypernet.com