most of them have set up teaming MOU's as a precaution
That seems to be the case with a lot of competitions, contender A teams with local team A, contender B, teams with local team B, etc, etc.
When it came to the PPB's, I think there were three contenders, Austal, one in Tasmania with Incat and a Nth Qld consortium too, three contenders and three different designs.
The submarines of course, three contenders, Japan, German and the winning French contender, but I suppose all three would have had some teaming arrangement with ASC and using the Techport common user facility, as that is where they were to be built locally, the question ultimately would have been, who would have had control and possibly, ownership of ASC's submarine arm?
The Future Frigates, again three contenders, probably about the only guarantee is that BAE Australia will be teaming with the Type 26 offering, again using the common user facility to launch them, but I'd imagine the winner would take over the ASC shipbuilding facilities currently being used for the AWD's, again depends on the future ownership and 'splitting' of ASC into two arms, if that happens.
So getting back to the OPV's, two German and one Dutch design, I'd imagine that both Austal and BAE are involved in teaming with the various designers.
The who, what, where and why of the OPV build, is anybody's guess, at least until there is some sort of public announcement.