Thanks for the input guys, I'll give it a lot of consideration.
I like the ergonomics of the palm hammer, I can only get one these new from the US plus taxes so will be quite costly.
The riveter seems better catered for with tooling and they are more widely available in the Uk, the issue I have with this tool is that it's a 2 handed job to control properly, so handling the panel at the same time is more difficult.
So maybe I need em both
Lastly I really need to understand imperial dimensions, I'm ok with inches and fractions, but when it comes to smaller increments like 1000's, it's just Greek to me. If anybody has got a conversion chart I would be gratefull. We are metric over here, not cm's tho.