Loki:
First of all good to hear that you going to have one 
the models that i have used are the empire hell storm rockets, i think they are really nice models, for the crew i converted some of the battle of skull pass dwarfs to act as loaders, i have some pics on my army blog
https://discourse.chaos-dwarfs.com/t/9189
(hope the link works if not its under army blogs under Loki’s army (pic heavy))
they are on the second page, also you might want to check out the death rocket gallery for some more ideas
http://www.chaos-dwarfs.com/forum/showthread.php?tid=2456