I guess I'm trying this primarily out of interest. To see (hear) for myself what matters and what doesn't.
I actually did get a real good deal on a used instrument. So I thought: let me at least experiment with some PUPs.
The long term goal is to try to figure out what "my tone" is ... and thus which higher-end instrument to start saving for (sadowsky, lakland, warwick, etc).
I feel like I'm being a dick here, but agree with some of your goals and others have left me kinda perplexed.
The interest I understand. I like to change around components and see what changes and what doesn't. It's interesting to find out what talk around TB is bunk if you use your head and your ears instead of listening to the prevailing wisdom (I'm not a believer in high mass bridges like the badass for example, based on my own experience. But I have had good experiences with bridges that are designed fundamentally from differently from a bent metal bridge, like the sTek that came on old Schecters). I like the flexibility of being able to change one component at a time and see what happens.
Even though you got a good deal, remember that you are holding a valuable, good instrument. Don't change everything just because you can, like other people said "if it ain't broke..." changing out the part isn't likely going to give you any improvement.
It's your long term goal that I don't really understand. If you are planning on using what you learn to buy an expensive instrument in the future, isn't this most expensive and labor intensive way to do it? Wouldn't you be better off playing many different basses in shops and friends' houses for free?
Now, I'm not trying to dissuade you, on the contrary, I just want you to think about what your goals are before you chop up a $1000 instrument. For me, it's been all about customizing the appearance and making it really feel like MY bass. Also, I wanted to see how cheap of a bass I could turn into a stunner. But most of all, at the end I wanted to have a bass that was my number one main player, a workhorse that I put my own blood, sweat, and tears into. So that's my thought, if you're going to really start modding, you might be happier trying to make your dream bass (rather than making a model for a boutique builder to build your dream bass around).
In my experience, here's the best bang for your buck mods:
S1 switch
pickups (I'm a die hard DiMarzio fan but your ears may differ)
straplocks
passive --> active or passive -->active
And the most fun: new paint and pickguard!
Notice what doesn't appear on here: new hardware
Good luck, have fun. BUT, when it's done or in progress, you have to keep us updated with pics regularly.