Without much experience (:roll:), I agree with everything said so far :lol:
I don't know, but I strongly suspect that replacing a fingerboard, for example, would change the "one-of-a-kind" feel of almost any guitar? Maybe for the good, maybe for the bad, but I suspect it would almost certainly change it?
If the reason I wanted to change a guitar was because I didn't like it's "one-of-a-kind" feel, then maybe yeah I'd consider it, but I tend to look at guitars as finished items that occasionally need repair or maintenance. I'm unlikely to mess with them structurally too much other than replacing or moving hardware about between guitars, swapping pups etc...
If the thing wasn't mostly "there" when I first tried it, then I'm unlikely to buy it. Having said that, you never quite know when you're caught in the middle of the GAS, do you... :lol:
I think the "better guitar" thing is something that haunts/troubles us all - and I suspect sometimes that it's not as important as it makes itself out to be. I tend to try to make myself think about "what is this better guitar I'm thinking about", what am I really after?
If what I'm actually lusting over is something at the "xyz" end of the spectrum, with luxurious woods, craftsmanship, etc, then me messing with my existing guitar from the "abc" end of the spectrum isn't going to get me there, it will still be a severely pimped "abc", and will have used up funds that could have been put aside to get me to the "xyz" guitar.
But on the other hand, if I'm not after the "xyz" guitar specifically, then pimping "abc" might well be worthwhile. But like Philly says, I'd be worried that the reason I loved the "abc" guitar in the first place might vanish while I was changing it...