Just keep everyone updated. i'm down in lewiston and know some people that would probably be defenant competitors. firstname.lastname@example.org
As for sponsors talk to some local gun related business' that are in idaho, wash, montana. ie. Seekins Precision (lewiston), Shawn Carlock at Defensive Edge & Bat Machine (both Rathdrum, Id), Proof Research (formerly Jense Precision in Great Falls, Mt), Lone Wolf (mt), Defiance Machine (Mt). You could even try to talk to ATK (speer, rcbs, weaver, blackhawk) in Lewiston. Good move with using AR steel for the targets. Are u sure that you dont want to include the 6.5 in the small target class.
Another important thing you want to include is the number of targets there will be and how many times a person will be shooting at them. Gotta know how many rounds to bring for each gun for each class.