I think that you maybe a bit on the small side with the rivet head, I've just had a quick look at a tender drawing, on the step tread these are held onto the backing sheet by 5/8" rivets (the rivet size is not the head size but the body size) as a rule of thumb the head size is about 1 1/2 times the size of the body so this would give a head size of 15/16". I punch far too many on an almost daily basis to be without it but it is still one of the most mind blowingly boring jobs. Its adjustable carriage and vernier control on positioning enable very precise positioning. The GW press controls the pressure and therefore depth of the "press" the anvil taking care of the shape. But it was tediously difficult to position and the process is boring enough without the routine of managing the impact. I managed for years with a copper (soft metal) panel pin and a hammer (fine metal working hammer) only the lightest of touch being required and the copper pin with a slight flat filed on the point. Certainly in 4mm the brass etch is very thin and there is a real risk of perforating the brass. I think even the smallest of those punches would be far too big. The 7mm press I consider as over-scale but does produce flatter looking heads. Even in 7mm the 4mm anvil is quite sufficient and it entirely depends on how much presence you want the rivets to have. The punches on the GW press are assisted by an anvil into which the rivet is formed. let's put some thought to this: A rivet head in 1:1 scale is about 0.5 inch across so in 4mm:ft about 0.15mm and is raised from the surface 1:1 by about 1/8 inch (approx 0.05mm). Would something in this metal punch set do the job ? The small one on the right looks promising. What size and type of punch is required for punching out 4mm scale rivets ? The dedicated tools for doing this job seem quite expensive.
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