Decade Box for 8 coding wheel Crouzet 84210 + 2 spacers + 2 edges
https://www.ebay.fr/p/2001631072?iid=143682926116
Hole is 88,6mm x 31,8mm, 70mm deep.
It's a 2 part thing. You'll need four M3x10mm to M3x16mm to fix the underneath cover directly in the print.
Holes for banana plug are 8,4mm in diameter (adjusted tolerance for my printing setup)
BNC 9,7mm + keyed plane for screwing.
And of course 10x 1Ω resistors, 10x 10Ω etc. and a lot of patience to solder/test everything.
Enjoy!

Creality

Ender 3 Pro

No

Yes

0.28

25%

Adjusted layers at 0.12mm for good rendering on top edges.