>>126333
What I would do is:
1. Look into the astral light and let it take form according to my intention.
OR
2. Same as above except I would have some of the material I intend to work with, would imprint those into the astral light, then wait for the material to take form into the suitable device one wishes to create.
All the little details just get filled in automatically in this way. Just like when you visualize an apple you get an apple but you didn't think about the texture or color of the skin, the specific bent of the stem, any markings or bruises on it, etc. it all just appears without you thinking about it.
BTW The Practise of Magical Evocation teaches you a bit about wands and since for the wand to even work in the first place it has to be regarded as an actual extension of one's own will powered by either one's own vitality or the universal vitality you must take every precaution to protect it and keep it from falling into the wrong hands as you will know with certainty beforehand that anyone who gets ahold of it will have their intentions obeyed when they are using it. There is a reason you put it in silk and do everything you can to make sure nobody ever touches or sees it, that it's as personal to you as possible, and that you can remove its charges and destroy it when needed.