That looks great !
Your boy will love it !
If you dont mind will you share what tap & dies do you use., are you talking about the black mixed in the red when you said "random black threads" or is this referencing something else..
I've been doing mine with AA and rhinoplastic...I had a really nice one I was working on today..until the 1/2 x 20 threads crumbled on me..oh well.
I don't have any alumilite..I don't think I've ever turned it before, if I have I didnt know.
Anyways I think I'll buy a few to try out., depending on where I'm reading from..AA, rhinoplastic , alumilite & ebonite are the recommended ones for threading. I'll add ebonite to my list of not having also.