If I were wanting to modify a '51 RI to be more like a real '51, here is what I would do:
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Also, there are builders making very cool slabs you should consider. My favorite is RSguitarworks, who restored my '55. They might build a '51 variant of their "Old Friend" series for you.
http://www.rsguitarworks.net
There are others that you might consider, too. Good luck!![]()
I own the RS Guitarworks "Old Friend" Slab Bass, and it's fantastic. The Darkstar pickup sounds great, but The could make it with the traditional Vintage-style pickup if you prefered that.
The workmanship on the bass is top-notch, and the prices are reasonable for a custom instrument. Here's one photo to whet you appetite.