You have chosen interesting railroading on which to base your railroad, Andre. We'll look forward to further stories about the KC&G.
I remember the Midland Valley, too, from visits to family in Tulsa in the 1950's. I always thought of it as an odd combination of secondary-looking track and multiple crossarm pole line. Maybe it would be a nice spring adventure to head up to Wichita and follow any remains of the MV right of way down to Tulsa.