After seeing the photos of the drawings, Kent's photo and some photos I have been sent as well as couple from my own collection. I think I can safely say there is an argument to say it would protrude out to at least halfway down the flash guard.
The blown turret of 833. A discussion could be had that the mg had been forced forward by the blast when the engineers blew the two tigers up, it is possible.
Looking at the other photos I think this looks about right. I will leave myself the option to be able to alter it if someone can produce evidence that its wrong. a removable spacer should do.
![Cool 8)](./images/smilies/icon_cool.gif)
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Thanks for the feedback, its always great to have different opinions.
Paul.
![Wink :wink:](./images/smilies/icon_wink.gif)