Hello Vincent (and others), I've been following this thread for some time now, with great joy!
I myself have a SIG Ryan... Errrm... almost two SIG Ryan STA Special kits. One I bought some 25 years ago, when I was still a kid. I started building it without any experience and, telling from Vincent's photos, I didn't do too bad. Unfortunately the parrot that I had at that time thought it would be a nice bite…
So a few years ago I bought a new-in-the-box kit from the US on eBay, which still lies untouched, waiting for the moment that I will have enough time to start a proper build. I might get back to you guys for some extra tips and tricks on this project.