Hey - that's a cool project!
I'm particularly impressed by the headstock job. Since I have a '77 4001 badly in need of some major repair work, including headstock restoration, that's a great source of inspiration!
But if this was my bass, I would have probably gone all the way and had the fat horns reshaped according to 60s specs... basically because I always felt they made the otherwise graceful outline of a 4000 series bass look plump.
After all the great efforts of getting the headstock shape and fireglo shading right, that would not only seem logical, but would also deliver the period-correct look and feel, IMHO.
On the other hand, I'm sure you must have discussed that as well, and yet decided to keep the existing body outline as it is... so is there a particular reason for that?
I'm just being curious, because although I don't personally like the fat horns, there's quite a few people out there who actually do...
Btw: I've just finished my "4003/4003s conversion" project this summer, where I actually did resize the horns to get a little rm1999 vibe in there. I'm attaching a few pics... if I'm not too stupid, that is
Cheers,
kiwi