Thanks Jim,
I tried making one years ago and failed when making my Titanic. I found the results uneven, so abandoned the idea. The tool has the variants of hand movements, so the depth and straightness of the line could not equal the precision of a sturdy fixed machine process.
Looking back, I wished I had made a dual press so that the 'rivets' were always parallel in line. I don't suppose it will show much at this scale anyway when painted.
Cheers
ken