Looks pretty good to me! Enjoying playing an instrument you made is more than worth the price of admission I find ;-)

You have to be careful with that guinea pig idea though. Some time ago I bought a cheap Chinese Jazz bass (an SX) thinking I would mod it a little. First I replaced the pickups and electronics. Then I practiced doing a setup on it before doing my first "real" setup and added a bone nut. It started to play well, so I replaced the pickups and electronics again, and added lighter tuners, a new pickguard and control plate. Then straplocks. I have a locking bridge for it, a new, lighter body on the painting rack, and I have shaped the headstock for a new neck... I think my little mod has gotten a bit out of control.