Way to go, Rolf!
You've come a long way from your first practice pieces, and I'd say you have it pretty well nailed now!
Maybe a few little things like Dave has pointed out, but if you made the final pistol like this practice piece, you would need to make no apologies at all.
The 0.025 silver is about what a lot of originals used, but the 0.040 would give you more thickness to comform it to the profile of the handle easier.
When you get around to the silver wire, let's see your design first. Also, somewhere on here, I posted some pics of an English officers fowler with a lot of silver wire inlay. I tittled it something like 'A silver wire beauty'. You might search for it, for ideas on wire inlay.
Impressed,
John