Bowing should be a definite concern. I built on a court last year and had significant bowing. The boards moved enough to tear my first liner (it was the thing holding the whole thing together). I think those sand bags would be enough. I was out there one morning, trying to figure out what the heck w...

This year I'm adding some bracing.
2x3's joined end to end, across the width of the rink. They'll be in tension and hopefully work with the cinder blocks and bags of sand on the outside to prevent bowing.
The 2x3's will be under the liner; I will pad them with strips of last year's liner.

That is a hell of a rink. I put is plastic kick plates last year (I think from Nice Rink). They caused problems when it rained. The rain got under the ice, which was frozen to the kick plates, and lifted the ice up/the ice floated up. This lifted the whole frame up and then allowed the frame to spre...