Regarding the rib tapes, here's a photo I took last year of the Mémorial Flight SPAD XIII (I couldn't get to the Sopwith any more as the field was getting cleared for the flying display!)

I don't think I'll be adding them to mine, it looks like the trio on Facebook does have them added, though.
A matter of personal preference, I guess.
Does anyone know if Part is still an active concern? You can still get their PE sets (from which I assume they are still being made?) but does anyone know if they might be developing new sets for the SPAD XIII or Sopwith?
jeroen