I have a '65 Gibson SG Jr. I am considering modding. First, let me tell you about the guitar before I dive into my mod ideas. Let me say, if this guitar was a clean, all original, I would not consider modding it (and I would not own it because it would be too expensive). I paid under $1,000 for the guitar because it has been heavily modded already. The tuners were replaced with ones off an '80's Les Paul, the bridge was replaced with some weird Japanese bridge from the '70's, and it has a bad refinish. The knobs were also not original to the guitar. It doesn't have any cracks that were repaired as far as I was told or that I can see (the finish is transparent). The original whammy bar is gone as well (you can see where the holes for it were filled). I was told it was owned by a group of 4 different guys in Georgia who all sold it back and forth to each other and modded it every time they owned it. It also smelled like an ash tray when I got it and took quite a while to get that smell out. The case isn't original either. Here are a few pics of what it looked like when I got it: When I got it, the guitar didn't stay in tune, so I replaced the tuners and the nut (which was in horrible shape), and I put on a proper wraparound bridge. Putting on the wraparound bridge, I realized why the bridge was swapped, the posts were drilled too close to the neck, so it is not really possible to intonate the guitar correctly. I was thinking of doing the following: I would either redrill the bridge holes further back or convert it to a tune-o-matic, or maybe even add a Bigsby B5. I would also refinish the guitar because the current finish is bad, the refinish (probably in polaris white or pelham blue) could also cover up the extra holes and things that have been drilled in the guitar (from moving the bridge, and the old whammy bar). The most blasphemous mod I am considering is I really want an SG with humbuckers. Instead of buying a newer Gibson that is hit or miss on quality (and I dislike most of the necks on current Gibson SGs I've played), I figured I could mod this one for dual humbuckers (and again the refinish could cover up the wood I would have to add at the ends of the P90 route). It is a guitar I know I like the feel of, but is this a horrible idea considering everything that has already been done to it? The bridge issue and finish really could use fixing, so that is part of why I thought to do this, in addition to wanting an SG with 'buckers. I doubt I will sell the guitar because I really like the neck on it, but can the value really drop much more if I further modded it? I paid just under $1,000 for it like 3 years ago, so it was well under market value because of the heavy modifications to it. Would a better refinish and moving the bridge (without routing for humbuckers) help or hurt the value do you think?