I added a "charging resistor", corrected the capacitance for the caps used to control the pulse width range, added a master safety switch, and made a few general changes, based on my latest shopping trip to Ax-Man surplus. See the updates below. I bought a big heat sink, with a huge SCR and blocking diode installed. I thought it was a good $19 spent. When I got home, I couldn't find a reference sheet or specs for either. I guess I'll just try them.
The main capacitors are smaller than I thought they would be. Anyway, here are some component pics as well.
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