Just found your post.
Yes, do Upgrade. I sadly recently sold my upgraded Thunder I.
A previous owner had routed out and installed a J pickup from a Jackson. I bought it off eBay and when I got it it looked like it sat in mud for 10 years. The hardware and strings were rusty as well. I gutted the electronics and finish was good still, so I buffed it out and polished it.
I installed all new gold hardware and new bridge. It got new EMG P/J pickups and had a setup and fret dress. AWESOME!!! It was a successful project and played and sounded like a dream!

