1. Get the brick working without collision.
2. Get port's dts exporter
3. Make a collision shape, no surfaces with more than 4 points, convex shape(that means no dents, or outside angles less than 180 degrees)
3a. Blender has a tool for this. Edit Mode > A(Select all) > delete(edges and faces only) > complete operation
3b. A(again, to select all vertices) > V(or was it ctrl+V, I don't remember) > "Convex shape"(it should make a convex shape and delete unused vertices)
4. Add the collision shape to a group.
5. Name the group "Collision-1"
6. Select ONLY the collision shape.
7. Use port's exporter to export the shape as dts( make sure you check the "selection only" box when exporting)
8. Move the exported .dts to your brick folder.
9. Modify your brick datablock (in server.cs?) add the field "CollisionShapeName = "folder/folder/folder/folder/shapename.dts";"
10. Profit???
I hope that helps.