Well there is an upgrade called ReplaceObject. That will allow you to change one Stinger site for another after an upgrade. Problem is your health resets and so does you veterency.
Mithral talked about a work around using kill module that somehow retains the info. Have to ask him that.
What you can do is actually an object upgrade. That way the object being upgraded uses his commandset to fire the upgrade, not the worker having to build differant types.
Well you start with your generic Stinger Site, than on your commandset have a button that fires your upgrade, upon upgrade to have your ReplaceObject actually switches your object.
The spawned units HAVE to have the site to survive, so they will probably drop dead but then your new Site should replace them. Not sure how easy it would be to go switching back and forth though.
