Ha! That is the one I went with too. Or at least, it is very similar to the one I went with.
So, I see some differences. You have mounted yours inverted from how I have mounted mine. Any reason?
I really wanted to be able to use a panavise mount, so I removed the stock projector mount center point and replaced it with 3/8 studs coming out of the top and bottom of the mount with idea that it would allow me to either hang it from the ceiling, or mount it from underneath.
If I do end up sticking with this double top/bottom mounting option, then I loose the option of having the turret gunner pits installed at all, versus having one on the top position, but not the bottom.
I still have some fine tuning to do.