Combining Meshes from Several Props

[Bobblehead]

I have two (or more) props with physics meshes obtained with [url]http://wiki.garrysmod.com/page/PhysObj/GetMeshConvexes[/url]
I would like to delete their current physics and turn them into one physics object by combining the physics meshes of the two objects.

For instance:
[t]http://cloud-4.steampowered.com/ugc/545261868538608410/2CC056E34668456A861E15E2B95A15CE35878AF6/[/t]

Make that into one prop and one physics object.

How would this be done, in theory?

EDIT: I'm thinking a custom CSG library?

[Pugsworth]

Combine the mesh data together and make it the collision for one prop, then parent the other to the main one.

That's how I'd do it.

[Bobblehead]

[QUOTE=vexx21322;46485421]Combine the mesh data together and make it the collision for one prop, then parent the other to the main one.

That's how I'd do it.[/QUOTE]

Makes sense, but how would I combine them. Any tip on the algorithm?

[Rubat]

Just look how perma poly weld tool did it.