Saw a video of something like this last year and after skinning a few last year I can really see this being useful.
I was cleaning up the garage and came across a few scrap peices of 1" 1/16 wall steel tube. I had picked up a few pairs of vise grips at HF, so I pretty much had everything I needed. A chop saw blade in a miter saw while it works takes forever to cut...it went pretty well and even welding the rebar to the vice grips was pretty easy. I just had er70s6 1/16 so that is the filler I used and it seemed to bond ok. I had to do some grinding on the rebar to get a good fit up, but that was the only part that took some time.
Still not sure how I am going to mount it - to the wall/post or a base and will use weight to keep it down
Here is the start of the frame
Here you can see the first vice grip welded on
Ran out of time tonight will wrap it up this weekend