For the most part VA follows FHA guidelines on what requirements a home needs to meet. You can find FHA's property requirements at http://www.hud.gov/offices/adm/hudclips/handbooks/hsgh/4150.
- you should find Appendix D pretty helpful. You can actually call the Construction & Valuation department at the St. Paul, MN VA regional loan center (that is who covers Missouri) and ask them specifics about your property, their contact information is at http://benefits.va.gov/stpaul/rlc_contacts.asp
and if you have any specific questions I'd be happy to help answer them too.