I think you should give it three chrome knobs, v/v/t, laid out in a line on a sloped angle like a Jazz Bass. If you go with the classic T-Bird layout, give them more room. I've always thought TBird knobs look cramped. If you want more tonal options, you could wire it with four knobs, v/t/v/t, but having that option on my Les Paul bass, I can say it doesn't really make much difference using Fralins and I could easily get by with three.