I decided on how I want the controls laid out on the control panel. See the picture below. I bought a variac on e-bay, so I've updated the BOM, also below.
I'm going to start thinking about my coil winding jig.
I've got an outline of the coil I'll wind. 10 ga magnet wire (the biggest I can get at Ax-Man), 3.5" long, (from the rule of thumb, coils should be 1 1/3 to 1 1/2 the length of the projectile), and the outer diameter not to exceed 1 1/2" diameter. However many layers I get in that volume is what I'll wind. to guide the magnetic flux, I'll use 3 1/8" steel washers at both ends of the coil, and if I can find an iron or steel pipe with a 1 1/2" inside diameter, I'll put the coil assembly inside it.
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