I'll try to take some photos under better light.
It's been a relatively cold winter, so it's been up and running since mid-December. I loosely followed this procedure. I used 2x8s and bolts for the frame so it's scalable. The lumber, plastic and hardware set me back about $220. The dimensions are 20'x35' which is just enough room to take a few hard strides, turn around, and repeat.
We had a nephew take his first skate ever on this rink on Boxing Day. Very rewarding.