Enzo - you know me prety well
Richard - I didn't even bother trying to clean up the scratches on mine - I suppose you could do an emery polish - start with a 320 grit and work your way up to a final polish with some 0000 steel wool. I just chalk it up as a little character on the backside. . . I hardly wear a belt (buckle) anymore, I find suspenders to be much more efficient!
The strap button relocation does help a bit with neck dive - this year when I see you at Bag End (thinking positive here) you can give her a test drive!
As far as getting it done - I just set a deadline for myself, took alot of pictures, went slowly and had it finished in two afternoons.
Good Luck and post some pics when you get it finished.