Well I found the 97LS could be a good platform too, I don't see why you'd go for even lighter considering the specs. No real advantage here IMO. Well it's supposed to have the same SW as the LS version while being about 20g lighter, but that's really about it.
EDIT: That said, most recent Wilson are foam filled; you'd have to dig out the foam to add silicone or similar in the handle. Makes customization tricky.