Matt, I built a single arm loader roughly 9 years ago in my garage with a 60 year old Marquette buzz box. It was based on pictures of a IH1000 i got from someone on the ATIS boards. I built it in my garage at college during winter semester and didn't have the cub there to go by, just measurements i had taken of it. I didn't have measurements of the loader either, but following the pictures i was able to guess at most of them.
I used 5x5x3/16" square tubing for the arm, and 4" channel for the mounting frame and other structural areas. The main column was also 5x5 tubing, i capped both ends of it and welded it to a 1/4" base plate, then gusseted the post to the plate, then made a matching plate on the frame so the rig could be bolted/unbolted from the mounting platform for ease of removal and mounting. I then bored holes as needed and made the post into a aux. tank for oil. I used 2 pieces of scrap tubbing on the sides of the post for the pivot points for the arm. Lotsa grease zerts. The bucket i made of scrap material i had, maybe 3/16". I think it was 36" wide. I used a 3" bore one way cylinder for the arm and a 2" 2 way for the bucket. The cylinders and control valve came off a IH combine. I made a quick and dirty by-pass block for the TC in machine shop at school.
It worked fairly well, i used it a few times, but i wanted it for dirt and i learned pretty quick a cub is hard to steer and overloaded with a bucket of dirt. It would be fine for snow and loose mulch or dirt, but i wouldn't want to get into anything too hard or heavy for fear of breaking something. I recently began recycling the loader for other projects. It was fun to build tho.
I recently began the planning stages of a backhoe attachment for my cub. It will basicly be a plan i have of a small trailer hoe converted to mount on the cub. Won't be super heavy but heavy enough for the cub and my needs. But that will be next winter, got alot of scrounging for parts to do, let alone other stuff.
.