Gus,
I don't know when you're planning the trip but let me know and I will be happy to give you a cell # in case you are in the STL area and need any kind of advice/ support. Your Katy plan looks solid but I might suggest taking a look at Hartsburg as a rest point. Its a great little town of 400 with a diner, 2 bars, and a winery. They also welcome campers in the "city park". Real friendly folks