If I may Eric. One of the forums I am a member of is hotscripts There you can find scripts for auctions classifieds and the like both commercial and free.
WFB is about the best in its field for quality of forms, It will make simple decisions based on input but Bids or Auction systems entails much much more. I am hoping that CC does put something like that together it would be mind blowing but I think you will have to look else where.
Having said that, using the HTML editor is the way to go to house a script like that and control the project.
You could also include a WFB form to answer questions from potential clients.
The Guy from OZ
Watch this space