I actually have a thread in the Art Request forum that I'm using to look for things like this. Basically, it's for works that involve using Devil Fruit powers for process-based situations. Unfortunately, it has yet to bring in any new material; most of what's in there are pics and doujin(sp?) that I've found and posted myself in the hopes of attracting interest in the subject; plus, it's almost all multi-limb pics of Robin since there's pretty much no other material involving Devil Fruit users using their abilities for process-based situations.
Anyway, stepping away from the shameless plug, this is a good idea, but I personally believe you're thinking a little small here. Law's powers can rearrange people's parts in
any way he feels like. They don't have to come out with a normal body that just has parts from a number of different people; be creative with the designs of the end product, throw in barrels or whatever, and so on.
Then again, I guess I could be missing the point, and part swap is really all you had in mind; if that's the case, just ignore the above. Unfortunately, I'm not really an artist, so there's not a lot I can do to make this idea happen anyway.