Sure, anytime...just hit me up in-game - my mains name is Draecas or go by fracted.9136. The mystic forge is kind-of an unknown quantity when it comes to what all one can create with it. But I do have a resource(link or google doc, id have to find it) that has an incomplete work-in-progress list of recipes for the mystic forge. I remember a specific section containing PVP recipes.
I'm not at home at the moment, but when I get back I'll see if I can't find the link.
As far as the above quote, to my knowledge it depends on how you enter initially. If you go in as a "squad/party" to the free tourneys then I think it gives you a 5 minute window to hop in once the battle starts, if you don't want to join in, you don't have to, but as long as someone from the original party continues on to the next battle, everyone else can join in if they want or not if they dont.
Too bad you can't research an upgrade that gives the guild 24/7 access to a battlefield wherein we can hop in and beat on each other whenever we like!