I started futzing around in 3DS Max, originally intending to make a variant on War Within Soundwave (as he appeared in the concept sketches). However, as I went along, I ended up designing something more than a bit different (though with a VAGUELY similar transform scheme). The original intent was to simply make a unique character but the end result puts me in mind of War Within Warpath, or something similar. And, yes, in tank mode the turret can spin freely. Tank mode: And Bot mode: I am mapping it over the next couple of days, then rigging and texturing it. Should be done by the end of the weekend.