Even more expensive? Ouch.
But yeah, a high resolution first kit and then cast thyselves seems the way to go with them then.
The Zeus cruiser hull was done that way, right?
On the "Legion" models:
Perhaps they need a better print (the middle part + bridge especially), but the back fin seems... awkward in a way to me. Could be me though. And with the pretty rectangular side panels the ships look rather blocky.
And for moving away from the GW look: the round symbol should be removed from the front panels and the bridge would need a redesign imo.
Wouldn't it als be cool if the panels were more like the ones you did for the conversion kit?