I'm trying to get more comfortable with Part and Draft WB by duplicating something I did with Part Design and Sketches.

Attached are two cut down files, one using PD and Sketch WB (Reamer_PartDesign_1.FCStd) and the other a partially done Draft (Reamer_Part_1.FCStd).

I'm wondering if anyone can give me some hints on the best way to get the Draft WB version laid out. As you can see from the sketch in the first file, it is constrained by positioning vertices at the intersection of rays at fixed angles with circles, plus angles between some of the sides of the polygon itself.

Problems I'm having:

1. How to lay out construction lines based on angles rather than trig computations to position the endpoint of the rays

2. I can line up one of the points on the lines with the construction, but when I go to move another point the whole polygon moves. Is there a way to keep the lines with "flexible length" so the endpoints can be positioned and they grow and shrink as needed?

3. How does one constrain two lines at a fixed angle?

Thanks for any clues.