Now I have read elsewhere that others have had less than ideal results with Alumahyde II, but I for one liked the results. As you can see from the photo, the match in colour and texture between my lower and the upper (which is anodized, straight from FN) is very close. And so far it appears to be quite resistant to scratches. (And you can't see the J B Weld, so there.)
Anyhow, that was my winter project. Here is the final result: