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Niu has a pretty good write up on design loads for aircraft landing gear. I will be consulting that when the time comes.
Aileron sizing is usually done to keep good authority at low speeds. I suspect some dihedral and good rudder authority will help as well. However, that doesn't help much in a paraplane, presumably.
As for crosswind landings, it would seem that a bird with a stall speed less than 30kts in a mild breeze could land on a sidewalk...the short way!
As for inspection, I have (or had) a flexible bore scope from my auto mechanic days. They are indeed handy and can be had for a reasonable price. Probably a good investment for ultralight owners.
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Hi Ivan:
I've gotten hold of an older copy of Niu, so thanks for that pointer. I thought I remembered a plane similar to yours, and I found it again:
https://flyhummel.com/ultra-cruiser/
Plans are $260, but they've got a construction video for $18. Looks like the design has been around for 20 years, so there should be good info on the interwebs about experience with the design.