Phil,
For the panel lines I use a hand engraving tool - 0.6mm wide, and scribe the lines with a few passes.
For a scribing guide, I laser cut the outline from sheets of plastic, about 0.6mm thick.
The curved piece above was used for the sloping panel line on the bottom of the forward fuselage. Taken from the CAD model with a sloping cut line, it was un-rolled into a flat surface to give the correct shape.
For the rivets, I am using pieces of hypodermic tube of the correct diameter in a Dremel drill. I laser cut a rivet guide in a couple of sizes out of 16" plywood. Just a light touch on slow speed is all that is required to make a clean rivet mark.
Paul