Help with .sur and collision groups

[Fagu_Aegeis]

First, the best way to make a good working .sur for a capship.
Second, what are and how do the collision gorup works.

[Nova]

Tutorial here: http://the-starport.net/freelancer/forum/viewtopic.php?post_id=35167#forumpost35167
I dont understand it after 4 stage. Good luck lol.