CrMo space frame. VERY stiff.
On the website with the page showing the specs, the igh version chart showed 26- (I think) 94 g.i.
Yep. These bikes are built to order, and the factory will accommodate
some level of personal preference. For serious IGH touring, go Rohloff - but no idea if the factory would build an SST that way.
I didn't think our OP would go for a Moulton. You kinda have to know you want a Moulton before you want one.
Anyway, one of Dr. Moulton's main design elements was the open frame, which our OP was after.