envmodel

i know this is really a mapping related question, but i know that none of the people there could answer this. So i aim this question at the esf team: is there a way to clip env_models in maps, so that they are solid ingame without changing the coding of esf?

im learning mapping ive learned all the usually missed steps from bob and a few other people, i HAVE got maps in game, now i made a model of samus's spaceship, it shows up ingame just fine id post a screenie, but im about to go to sleep, but its not solids, you can walk right through it, how do...