I have to say I think there is too much if, what, when, etc, above for anyone to give you an accurate response. If you have the land and need, and experience these days it seems, then you shouldn't have a problem...
I rather think with all the variations here the responses could be all over the place, may I suggest the best course of action is to simply ring your FEO or Firearms region and have a chat.
Most are quite human and helpful, and at the end of the day what they say is likely to be a lot more relevant than what anyone here may say.
....and don't take this the wrong way..i