Maybe the middle of the ship could be given more a skeletal structure with the cargo pods inside? Not a ton of fps-sucking detail... just a few big support beams. That's just to appease people who like cargo pods on big transports. Personally I like the look of it now.
Re: weapons loadouts for this (and the whale), I know you want to make these ships unable to fight. Trouble is NO guns makes them unable to mine as well. Give this guy one class 1 turret mounted above the bridge as a means to fill it's hold for free. [Yeah, mining thousands of units is hella boring, but if you're a miner that's "roleplay" :-) ]