We built 2 a while ago that were alot like what Jake and Harry are talking about. Both ends hinged down and the tops(divided in the middle) slid off of their prospective ends. The lids were kinda bulky but other than that it worked great. We used some exterior grade fir plywood that came in 10' or12' lengths so no scarfing or side joints was necessary.It's is finally starting to deteriorate after about 15 years.
After all that effort and material cost I'd definitely go with a pre-made, as I don't seem to have the time anymore. I got one from another NC sailor awhile back that's galvanized sheet metal and works great. It was also very affordable. If this is what dessert Trey is offering I'd jump on it.
Todd


"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White