I added the traverse to my Stug. I upgraded the elevation and added depression (something the stock HL stug III was sorely missing) to my HL Tamlong Stug It is FO Tamiya with the IR battle system. Here is a video of it in action: http://www.youtube.com/watch?v=V3Kfxw_JMvY You have good timing I just posted it.
I used two Tamiya elevation units. I don't have any pix available now since they are in my latptop that is out for service. I had to do a great deal of triming on the mantlet edges. I then added a screw to the fixed trunion from the top of the turret so that it would traverse. I did used the shorter gun barrel since the log was too heavy for the elevation without a recoil unit.