Summary

UPDATE: July, 2022: THE THINGIVERSE WEBSITE IS BROKEN and I'm moving my content elsewhere soon.

2022_06_08: I went looking for a sloped-front control box. I found some but they're very expensive so I designed my own. This one has room for two PWM controllers and two rocker switches. Panels need M4 heat set inserts and they can be fastened together with M4 x 8 or 10mm button head cap screws. Side panels can be printed or cut from thin plastic or card stock. There's a template provided to save a lot of printing time. Use two sided sticky tape to hold the template in place. I used some plastic sheet from TAP Plastics. It can be cut with a decent pair of scissors or a paper cutter. It's a good idea to center punch the hole locations before drilling them out. Use a 3.5mm drill. Holes to mount sides need to be tapped M3. Sides can be attached with M3 x 8 or 10mm button head cap screws.
Print all pieces as presented and no support will be needed.
I set fill at 30% and the pattern is tri-hexagon.
The four large holes in the back are the right size for these connectors: https://www.amazon.com/dp/B08SJM2G52?psc=1&ref=ppx_yo2ov_dt_b_product_details

2022_06_09: I replaced cba_Top_01 with cba_Top_02. This strengthens the corners that have to be threaded M3. I also enlarged the holes just a bit so the control knob stems fit more easily.
PS here's a link to a heat set insert tool that will make life easier: https://www.thingiverse.com/thing:3613621