Lightweight aluminium wraparound bridge (for the princely sum of USD19; compared to MojoAxe, TonePros etc at around USD140)
Vintage length steel anchors - the rationale is that if the top timber is crappy & soft, the anchors will have a bit more to hang on to.
Locking studs (cheapies again, not TonePros)
Knob indicators for coolness factor
Plastic jack plate
All up came to about $87 delivered. Pretty happy with that bridge, I saw the vendor (Philadelphia Luthier Supplies) mentioned somewhere on les paul forums when I was looking for options. Just getting the Kluson version locally would have cost $60 + shipping.
I still have more bits to go - tuners & electronics (& more spousal projects to complete)- before I can start drilling holes & sanding, but I’m calling it progress.