Why don't you just use the FGD that came with Beta 2?
5) Can I make my own map for RE: CB?Yes, of course! The FGD will be made available to the public very soon. Probably around New Year. The FGD will come with documentation on the new entities.
I could have swarn it was in the folder.Anyway, a quote from README.DOC:
I'd suggest you base it off the Spirit of Half-Life FGD for now.