Loving it Isotope!
I think the removal of the horrid top vent and using a standard marine razorback turret will end up being a fairly common Stormraven conversion. It is so simple and really improves the lines of the kit.
I love your Egyptian take on the dread. The one piece of advice I would offer, is to somehow break up the hard flat edge of the cloth that extends between the legs of the front figure, where it would normally meet the base. That articifially harsh horizontal line doesn't go with the flowing lines of drapery everywhere else on the model. A tiny bit of greenstuff and some subtle dremeling/shaving should do it.
-Larry