OK, having had this ship for a little while, I'd like to post my comments on it.

First off, we really need to move the majority of the mining beams to a M-Port. Leave a few basic ones in S-ports and L-ports, and then create a mining variant of the Wraith, Atlas, Centaur, and re-do the Marauder, with M-ports for the specialized beams. Giving the marauder a L-port is just a bit too powerful. (plus then the mining centaur could have 1-S 3-M)

Until the above can be implimented, to balance the Mining Maud, it needs ~1000 more mass. Right now its lighter than most warthogs at a base mass of 5k, and having 12k armor makes it overly powerful as a combat ship.

Its a mining ship, so lets cut its top speed to 50, and reduce its top turbo to 160. Leave the infinite turbo on it, and to compensate, lets crank the thrust up to around 250/260 to compensate for the mass of all that ore its supposed to be holding, then add an additional 10 cargo as well.

I'm not sure what levels are required to get it, but i would reccomend trade of 10 and mining of at least 7.

/me pictures a "Mining Valkyrie" with an L-port and 3500kg of mass...
-:sigma.SB