Looks like I never finished the doc. Here it is, but it isn't very polished.
https://drive.google.com/file/d/1C6MY8a5vsC4U_Bxrq9TpKkQ66hT4ucVb/view?usp=sharing
The brackets are ones that I designed and 3D print. Let me know if you want a pair. I have a kit that is everything but the speaker wire 7 wire wrap (brackets, speaker cloth, quick disconnects, spade connectors).