I had one apart the other day, the spacing for the bolts looks the same to me, and Crooks replaced the block on it with a 42mm before he passed it on to me. All the OFR parts should fit the Schaller, just the base plate is different and the lock screws are shorter (but the same diameter/thread).
You know, sadly, the graphics turned a lot of people off. The WMI Korean and USA guitars were actually pretty high quality, but some of the designs were...not optimal. Even the wrap guitars had the potential to be something different, but..
Schaller is fine, cheaper and more in the right vibe, since the Schaller is basically the JT-590 trem from the Pros but with better intonation screw hole inserts so they don't strip out.
All the XLs have a pretty cool neck profile that's a little thinner than the standard Soloist profile, IMO. I love my Dinky XLs neck.
The Jackson pickups will suck. :lol:
Much as I might agree with your sentiment (I'm a big Gotoh fan), the fine tuners are definitely what the OP is looking at moving. The 1000 Series Pro should take care of that.
^ The Korean Jacksons I've played have all been good. I've been kinda looking for a DK7 modern to show up used, because the one's I've played have been pretty damn good.
Changing power tubes should be all you need to do, and that's pretty easy. Unless one is ringing or something, preamp tubes last a long, long time so I wouldn't worry about those.