I really think the PBG-2 has a lot of potential. As it is, it's a pretty cool looking guitar, but I think these additions could take it to another level:
Neck & body binding
Flame or quilt veneers
Contoured top (like a PRS or LP)
Baritone scale length neck
Semi hollow version with F holes
Different trem styles (Bigsby might look classy)
I've probably missed a few cliches out, but you get my drift.