Sounds nice! I used to help build my old field back east. I was wondering how many acres of land you have? If you have at least 20 acres, my two cents would be that you build a fire base. Kinda like a command post to put it into layman's terms, but with some serious defensive positions.
Ex. Bunkers, trench systems, fox holes, and some debris like plywood and pallets lining the perimeter.
Depending on the scenario, fire fights can get INTENSE. Loads of fun
Also a good thing to do if you need help building and whatnot, host a build day every now and then, people bring their own tools and building supplies, basically what ever they can find, build stuff for most of the day, and play a few matches with what you built.
After a few build days, you should have a pretty nice field.