The loan term is driven by several factors including loan size and your credit rating. I would expect to have a rate of about 4.500% on any type of rehab loan (30 year fixed w/ zero points) and you should certainly work with somebody who specializes in these loans instead of somebody who does them part time.
http://www.trulia.com/profile/brentkluge/ Brent Kluge pretty much does only 203k loans and does loans in Missouri (even though he is in Maryland).
http://www.trulia.com/voices/qa/activity/Missouri---25/q_203k/ is a link to all of the questions that contain "203k" in Missouri here at Trulia, sorted by how recent the responses were, check out the various responses and you'll see loan officers responding and real estate agents recommending some.
As it seems you are trying to purchase a property, I would hope you have a real estate agent representing you. Ask your agent as he/she should have local banking contacts that can counsel you on options. The chances of getting what you need done in 2 weeks is virtually impossible, given the underwriting requirements most lenders have and especially on a 203K type loan. You will more than likely need to ask for an extension for your loan. Talk to your agent.