Easy to build. Walk through a decent sized (skid steer) dealer or rental yard (that has a bunch of ssqa attachments) with your camera and notice the slight differences. All you need to watch (besides the obvious dimensions) is the angle of the top "hook" and IIRC it's 45 deg. and the bottom angle at the pin surface. I'll always use stout (3/8") material in these areas, but fastening it to the particular attachment plate, I'll consider the strength of the attachment itself. Generally a store bought "plate" is built on a 1/4" sheet, this may not be necessary if, say you built a heavy frame for a set of forks vs a hyd. auger. If your avatar tractor has ssqa, you can build off of it, starting at the top. Hang it on there and work your way down. There is a second set of pin holes in the bottom that I think is some old holdover from an earlier machine. I think it's the set of pin slots that are the widest. What is on your machine should be all you need to copy to make it compatible with all recent year machines.