thanks for all the information, I'll try to see what I can do with them, and of course thanks for the invitation, it would be surely a big pleasure.
I've entered the live steam world just at the beginnig of this year eventually buying my first loco, so I still haven't tried to gather the event in Casarile, the place you probably thought about, but I'd really like to, after this virus plage will vanish away (hopefully...).
about the drain cocks, since the majority of gauge 1 locos don't have it, I guess it is not a must-have, but for the fine regulation of the loco, expecially in shunting, I reckon them useful.
What I would also like to do is fitting the loco with a flywheel, like the Slomo I saw online, but still have to see how. I'm still not so good in working on my lathe and milling machine...