So I made a nice assault vehicle with a couple of these on it only to discover to mu horror there is a limit of one. So, I had a look at making something with one drill out of curiosity and well, it is just horrible. Unwieldy, cockpit pretty much blocked by the huge fat drill and despite all that, doesn't seem to offer anything my usual 6 drill little HV can do so much better. But two of them, that seems useful (they arn't then in the way, not to mention much more useful for tunnel construction) and yet they have banned it which seems rather petty or maybe I am missing something to understand this weird limit. So, does anyone actually use these in their designs or is my current impression about right - good idea, bad execution and pointlessly limit crippled so as to make them non usable?