Thunderfire, HOOOOOOO

I like the idea of a thunderfire cannon, but a huge lump of metal that size seems likely to chip or be dropped too often for my tastes.
So I'm making my own!
Here's what I have so far. It should probably have some sort of movement device, but I figure the stabilizer things lift up and it hovers, or something. I dunno.


I've got one of the old techmarines manning it.

I'm not sure what to do with the space between the rockets. Leave it blank?


More rockets?


Vaguely phallic glowy targeting gubbinz?