Hi CamP
I love the old guitars and have owned four ‘85 PRS, including two double-digit Customs. My sense of the value of your guitar is similar to Sergio’s, as the mods take almost all the collector interest out of the guitar. I also don’t think it’s worth trying to restore the guitar to improve the sales value, as no matter what you do the originality is gone.
The old pre-Standards are generally much less sought after than similar aged Customs, so even in perfect unmolested condition it’d probably be worth less than you’d hope - I can think of one early pre-Standard that has remained unsold for a very long time due to (in my opinion) a ridiculous asking price. So just because somebody is asking a lot of money for an ostensibly similar guitar doesn’t mean the market will pay that.
As an aside, if your guitar is very early (say under 40 serial) I’d love to know what pickups are in it - 7 and 8s as a guess. Photos would be nice if you have time
The other thing I can see is your guitar (like most early ‘85s) has the strap button much further around the upper horn than on later guitars.
When I met PRSh a while ago I took one of my early Customs along (circa serial 50) and the first thing he said on seeing the case was the original cases were all made with the pockets too big (leaving no room for the guitar's upper horn) and that he had had to personally modify them all to make the guitars fit. So, if your case is original to the guitar my guess is it will have a bit of the pocket wall cut away to make space for the strap pin to fit.
Having owned and pulled apart a couple of Customs around the 50 serial (one above one below) a few things are different to even slightly later '85 guitars - pickups (7 and 8s then T and Bs that are different to later T and Bs), the trem block and trem arm finishing, the plastic used for the truss rod cover plus the cases as mentioned. The first guitars also had S-branded machine heads and copper-topped sweet-switches, which again have a value. Ditto the 1985 dated volume pot (as a guess Centralab, marked 19th week of 1985). So the parts will have some value to anyone looking to restore another very early guitar with correct bits.