[blodia]

i've been looking into this more, it seems m_nSolidType 2 is an axis-aligned bounding box so it can't be rotated, its aligned to the world axis and will normally grow/shrink to fit the model.

m_nSolidType 3 is an orientated bounding box which is what you need but looking in const.h of the sdk files it seems its not implemented.

http://developer.valvesoftware.com/wiki/Bounding_volume
http://developer.valvesoftware.com/wiki/Bounding_box