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Just noticed this was an older post. I've been away for a while, hope this still helps you:
I have a 3 PUP 57 Custom RI, no Bigsby. Sounds great, although I've contemplated lowering the middle, more for ergonomics than sonics.
There are lefty 57 Custom varieties with Bigsby, 2 PUP, and the elusive master volume. Also rare are the 54 RI with the staple PUP, which I still have GAS for and narrowly missed one, a TH from Japan.