The air pipe behind the seat, and the canister on the port side by the ejection seat, what are those made of? 

You said you used spare phot etch, what did you do to rivet mark that, in terms of roller size?  I was able to easily remove the raised portion and cut the back to match, but I am having a hell of a time trying to scratch build the yellow areas like you did here.  If you could give me any tips where to find the material to make that I'd be grateful.  I am in the middle of building my own YF-23 as I write this. 

Thank you