Does anyone have a guestimate of repair costs for full rehabs in Kansas City?
That would depend greatly on the size of the house, what contractor does the work, what finishes are used, and how you define "full rehab". There are just too many variables to give even a ballpark estimate.
You may be able to search online for turn-key companies that post their rehab cost along with before and after pictures. Just look for ones in that area. This may give you some sort of idea but I agree with @Jim Viens . There are too many variables to that question. At least this will give you a place to start.