Much of the muchness mate. Bead and cove planks work well with square section planks or hulls having long runs (multihulls for example) but the problem lies in the fact that since most strip plank composite cores are anything from 6mm upwards, having a square section here is ridiculous. For example a 9mm square section means a lot of planking and glueing. Thats why most plank with rectangular planks.
Another problem using bead and cove rectangular planks means you still have to fit the planks (if you don't want edge set) which means that you have to either cut off the bead or the cove. Cut off the bead and you've cut a lot of filling to do in the cove. Cut the cove and you'll have trouble working the glue around the bead. I've mucked around with bead and cove and personally I found the whole idea a waste of time and money. It was ok planking the topsides, but planking the turn of the bilge and the bottom plate was damn frustrating.
Overall bead and cove , like all things, has it's place. What you do is up to you !!
I wonder how the weight would compare to a more traditional "wet" process,
Any weight gained or lost here is nothing compared to the weight gained or lost when it comes to fitting out. Plywood comes in so many weights (densitys) which I've found through testing that don't match the manufactureer's specs or the builders decides to use cheap heavy plywood to save money. This doesn't take into account where the builder change the design (add cabins/ move interior joinery or add or subtract from.) This is what you've got to keep and eye on.
I did some testing today on some gaboon plywood which was sent to me to test (mechanical properties and density). They advertised the plywood had a density off 430 kg.m^3, yet on testing it was between 580 - 600 kgm^3. That is a huge difference and overall, it will add a lot to the hull weight. This is what you need to be watching out for.. more than anything.
I actually wrote an article on this a while back, but that's another story.
Here's the link: http://www.bowdidgemarinedesigns.com...s_Article.html
Hope this helps
Anyway, have a good one and havagreatweekend