I am surprised that joint failed Bently, Thanks for taking the time to do that and posting the results.
Looking at it, I’m curious as to how the load would be distributed on that frame, is the bottom corner of the leg acting as the fulcrum, thereby adding leverage to the load? Is that why it failed?
Does anyone have any answer as to how the load would be carried on a frame like this?
If the top is 100kg, do each of those members carry 25kg?
Just curious. I’m feeling better about passing on this one now.

Doing the best I can with what I've got