I went with Bloughsburgh's idea about the base ogre a bit and made some sort of chainsaw/grenlauncher fuse.
http://i.imgur.com/MPgv3TR.png
but I'm not entirely sure about it.
Do you know if it is necessery in quake to merge the model geometry with the weapon?
All quake models that have weapons seem to be one solid object. Could I have disconnected geometry in my model?