To my knowledge there is no rules, either NFHS or KSHSAA that states a minimum size for a high school wrestling practice room. Obviously it is the responsibility of the school's administration and the USD's board to provide adaquate measures to insure the safety of the participants. For example mats for the walls so kids don't crack their head. Concordia's wrestling room only has like a 7 ft ceiling, you can actually touch it if you raise your hand up, and pillars right in the middle of the room, and yet they seem to survive.

Obviously if you are concerned for your safety or are just plain mad, the best thing to do is organize everyone you can for your cause and take it to the school board. But if your program isn't very successful I doubt you will have much luck.