I took an SX fretless I wasn't playing and did the following to it:
- Replaced the neck with a fretted SX neck (and I bought a couple of them to get one that felt right!)
- Replaced the stock pickups with Nordstrand NJ5S pickups
- Added an Audere 4-band preamp and replaced the stock knobs with chrome Audere knobs
- Replaced the stock white pickguard with a custom cut WD Music 4-ply tort pick guard
- Replaced the stock strap locks with Ernie Ball strap locks
- Replaced the stock bridge with a Hipshot "A" style bridge
- Replaced the stock tuners with Hipshot Ultralite tuners
- Added a roller-style string tree to the headstock
- Had a professional luthier do all of the assembly and also cut a new side jack since the Audere preamp used all four holes on the control plate.
Even buying all but the preamp and the pickguard used, I still spent probably 4-5 times what the original bass cost on parts and labor. Was it cost effective? Hell no! This was probably one of the stupidest financial decisions I've ever made!

But I had fun learning some things about basses, I have a unique instrument that is tailored to me and valuable only to me, I have a bass that sounds FANTASTIC in a band setting, and it's a great dive bar bass that would never get the attention of anyone considering stealing it simply because of the SX label on the headstock.
It took me a while to finally bring it out to play with the band but I did that recently and, even though they gave me some strange looks when I took it out of the case, they loved how it sounded. So did I!