Bryn, I used 25x25 with 1.6mm wall. I used a couple of pieces of 16x16 2mm wall. I will be replacing the lowest horizontal bar with the 16x16 to save a bit of weight. After building this I can see having the weight as high up as possible means lower NM gas trusts can be used. Might even put a new bit of cargo track higher up on the door so that would be a bit of steel I can cut off.
As I said I'm going to give it a try out and hope it goes ok. Might be a pile of steel a towns recycle bin somewhere but I hope not.
Bruce CQ
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