you could cnc a plate that has 3 boom clamps 120 degrees apart and then cnc legs that attach to the booms with more clamps.
I have just received my 3 axis add on from Armbgc. The PDF instruction manual on their website is a little out of date as it does not relate to any of the pins etc that I have on my board. Does anyone know where to get a better wiring diagram or can anyone help? Thanks Kat