I did find a small bug, easy fix. For so long I thought it was stock, and I was just going to correct it with SuperfluousNodes, but it turns out it's KIS.
The added Nodes on the 2x2 structural panel need to be fixed. I noticed one of the corners on one side didn't have a node some time ago.
@PART[structuralPanel2] {
%node_stack_topSW = -0.5, 0.0275, -0.5, 0, 1, 0, 0
%node_stack_topSE = 0.5, 0.0275, -0.5, 0, 1, 0, 0
%node_stack_topNW = -0.5, 0.0275, 0.5, 0, 1, 0, 0
%node_stack_topNE = 0.5, 0.0275, 0.5, 0, 1, 0, 0
%node_stack_bottomSW = -0.5,-0.0275, -0.5, 0, -1, 0, 0
%node_stack_bottomSW = 0.5,-0.0275, -0.5, 0, -1, 0, 0
%node_stack_bottomNW = -0.5,-0.0275, 0.5, 0, -1, 0, 0
%node_stack_bottomNE = 0.5,-0.0275, 0.5, 0, -1, 0, 0
}
Change one to bottomSE and all is good.