No problem! The forum software is actually the same forum software that we are using on ArchiTalk (
PHPBB). The nice thing is it's free/donation! I decided to go with the PHPBB soft, primarily because you can setup multiple groups (for security reasons), and people can be members of more than one group. Combine this with the powerfull attachment mod, and you can attach .pdf files from plotmaker/archiCAD directly in the post, so your client has EVERYTHING right there for them.
If your current ISP doesn't offer multiple ftp accounts, I'd suggest working with amhosting.com. Those guys are great, they are always prompt with responses (sometimes within minutes), curteous, fast, and effective, and their services come at a MUCH lower price.