Bill,
I think your build is progressing fine. I don't see a whole lot of "mistakes". I do however think your kit itself is a little off. By looking at the drum cupola and letter box on the front slope, I'm assuming that this is supposed to be an aus D. The mantlet, however, only has one hole for the gunners sight. Monocular sights weren't fitted to the D. You don't mention who made this kit, but this mistake is on them.
Your work is good, keep it up and post more pics with better light so we can enjoy it!
Good luck Steve