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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