I like the idea, although I'd prefer it to be less powerful overall, but also be able to be mounted on cruisers as well as battleships. Get 2 or 3 of them together and they should be able to take down a base in a few hours at most.
@ Jack
I like much of what you said in your op, but I don't agree about oorp regulation on where a base can be placed. It should be dealt with inrp IMO....if someone builds a base at a jumphole then the local authorities should remove it before it becomes a problem. If no one does before it hits core 4 then it wasn't a problem to begin with apparently.
There is a fine line between creating rules to ensure fair play and creating rules to ensure some people don't QQ because they can't have it easy. I don't think the latter should be encouraged. It should be handled inrp.