I have a few new pics to share of my zero.....
I wish "boxman" could chime in and explain what he used to scribe his panel lines onto his gun-hood and cowl.
I would think that an Exacto would be too narrow.
Exacto worked well, I wish that I took a pic before work was done to gunhood. Also made mg's from nyrod tubing with holes drilled and smaller tubing stuck inside for barrel.

An overall view of my work(still not 100% done) on the weathering and exhaust stains for the fuse.

I was a bit disappointed with the plastic tailcone that was supplied but, a coat of paint, then scribed panel line and some rivets helped.
I also did some work on the tailwheel area, I just couldn't live with the musicwire tailwheel strut/axle so I gave it a little going over.