Hi Matt,
It is impressively stiff.
Considering that when honeycombing the tail cores I had decided to experiment with a diamond pattern with very narrow remaining walls it is even more impressive.
What it is going to be like when the outside is done as well remains to be seen but it is shaping up to be incredible - almost !
I will keep you informed as this develops
I have something cooking using your undercarriage recipe as well.
More later.

Brian