Why is the Hacker Gunship sold at Mactan if it can't actually get undocked? The stuff in the normal "stuck resolution" thread doesn't work in this case because of the big hatch that closes after the undock sequence 'completes'.
I bought the GS on the PvP server and on the RP server, and didn't have this trouble...but I've had it with other ships. You CAN get out, but it's really tricky even in a fighter. Here's what you do.
Select the station, then hit your "dock" key, whatever it is (usually f3). You'll be running into the wall, and the docking hatch will open. You have to switch back to free flight and dash out; the hatch will start to close as soon as you go to free flight, so you have to be quick. But it can be done. It's the only thing I know to do in such a situation.
I sort of recall having similar problems long ago with another mod. Not much anyone can do especially in SP mode. I suggest getting the "Ioncross Character Editor" (google it and the first hit should be what you want) and use it to move your ship to a place where you can undock safely. Hope that helps.