There are a couple of other options, but they look more like a B5 than the B7. The wigsby will be approximately the same size as a B7, and has a flashy/retro look, but they're no longer being produced (I found a new lefty model on eBay recently, but a RH model can be adapted to lefty fairly easily). if a brushed or matte finish was acceptable, it would be much easier to fabricate from sheet metal.Ī different vibrato is a Wilkinson Wigsby, although installation requires routing a pocket/recess in the top of the body. The plate wouldn't be extremely difficult to fabricate, but the highly polished and plated finish would likely result in a high price. I mentioned supposedly because I wasn't able to locate a dealer selling them, but there are numerous mentions including a Youtube video demonstration. But, there is supposedly a mounting plate available which changes the appearance considerably. I understand what you said regarding the B5. If the hinged endplate can be reshaped without making it too fragile/easily broken, then go for it.
The pics in the links you supplied show that B7s have been installed on SG bodies, although as some comments suggest, some additional shaping of the hinged tailpiece/endplate may be required. The comments received so far have indicated that the B7 wasn't specifically designed for guitars with sculpted/chamfered edges. always good to have another Epiphone fan join, plus a lefty at that. I'd also like to extend a Welcome To The Forum.