You don't need to solder to the shielding, there are alternatives. You can simply tape down a length of wire with the end exposed with another bit of shielding tape. Or you can use a crimp eyelet on a wire and use a small screw to hold it to the tape, or even solder a wire to a small washer and screw that down to the shielding tape. I've done all three.
Tuner orientation? Up to you really. The tuners work the same, and certainly for the upper tuners on a 2+2 setup, they are easier to turn if you've got the guitar on a strap if they face you slightly. Not quite so sure about the lower ones. Looking at current SR basses, the top tuners are angled back slightly, the bottom ones are straight.
I don't know anyone who uses a bass tuner winder (most bass players don't change their strings anything like as often as guitar players), but they exist and angled tuners could stop them working if the handle catches on the headstock or the next tuner key because of the angle.
Last edited by Simon Barden; 28-07-2023 at 06:32 AM.