Yeah, that's one thing that bugs me when people complain about models 'not being able to fit' in transports in 40k. They really could.
Anyone who's been inside a military APC will tell you that there is -no- space in there that goes unused.
On-topic:
That's an expensive-looking conversion, Meph, but great job so far.
Not to my tastes, but that's just me: I like Stormravens just fine the way they are.