Here's whats goin' on:

1. My map runs fine when i host it myself with half-life.
2. My map crashes our pub when i try to change to my map.

Does anybody know what could make a map that works on my own IP just fine crash on a public server?

do you have the error log from the server? You might not have the models and such you need on the server. Try sending it to a friend and see if he can run it local.

Thx m8, that fixed it :D