a base idear

im sure this has already been posted but i have a empty pond thats big enough to put a 4 car garage in and iwas wanting to clear some trees out use them for bunkers and build like a huge base made out of like ply wood and 2x4's u no taht sorda thing. to get to the pond there is a huge hill bout 15 ft tall all around the pond. the pond is like in the top of that big hill and ths pond is 15 ft deep. i was planning on putting wattch towers around the base and a tunnel going through the hill into the base so i can drive tanks in and the howitzers in( of course im am gonna have a huge gate to block the tunnel off) and i think it would be awesome to have zip lines to each watch tower but i prob wont do it.  the only problem is when it rains its a pond where there it never holds water unless it rains hard but im tryin to figure out how to make the rain drain somwhere else? if i ever so this ill have a huge war like 100 or 2000 peeps on each team and i might fet my local ez paintball store to sponsor it since i no the peeps who work there!!!!!!!!! if u have any more idears please reply

if i did do it ill use a back hoe and i do have a place to put the water theres aline of irrigation for the crops behind our house