if your going to do the outdoor thing and its mainly gonna be recball then u could go to a junk/scrap yard and see wat kind of makeshift bunkers you can make, use an old car, or the giant spools used for the hose and old plastic drainage tubes. i mean thats the kind of stuff stuff they have at the recball field i play at and everyone has a blast, (www.wildplanetpaintball.com) this is the website it has video tours so that you can get an idea as to what im talking ablout. hope this could help.