HSW Snap to Multiboard Big Thread 8mm Offset

I have a ton of HSW things printed and I'm in the process of switching to Multiboard.. was looking for a threaded adapter to use. Stumbled upon the one from https://www.printables.com/model/775456-multiboard-hsw-snap-adapter but it didn't exactly fit what I was looking for. There is a 20mm version and a 9mm version provided but I really wanted something that would fit against the wall where I installed Multiboard with the 8mm offsets.. (this also helps provide stability to the rest of the board). Grabbed the step from the 20mm version and adjusted to 14.9ish which is what my caliper seemed to indicate. Also adjusted some of the geometry on several edges. It's a pretty snug fit against the wall - might damage drywall (I'm mounted on plywood).