I cut out of an old Pershing this little thing ( don´t know the exactly word for this in english, we call this Tankdeckel )
Then i buildt an little Case out of 2 mm Plasticsheed and fill this up, with Powerputty ( Pattex ). Then i push the Tankdeckel in there
At the Waiting Time i was building the Case for the Canon and fill this up with Resin, for make this stronger. Tommorow i will sand this to bring it more in Form
Hm, looks a little like an M3 :P