I went to the National Flemish Giant webpage and the only person I found in KS/Mo that is listed with them is:
Rocky and Terri Altic (Hillbilly Rabbitry)
Pleasant Hope, Missouri
Sandy, Fawn, White, Light Gray, Steel Gray, Black, Blue
There were some rabbits shows listed on the site in Abilene, KS and Neosho (sp?), Mo. You can find the link here:
Finally, here is the link for the members of the Central States Flemish Giant breeders club:
The only name from there I recognize (I'm a new flemish breeder) is the Clouse family - I know they are respected and active members of the National club if I remember right.
Edited to add: I'm moving this to the rabbitry area and pm'ing the original poster to let them know!