Some great ideas and suggestions here. Love henchards porches, they look great.
Only point I would make, is you mentioned putting in hard standing for a couple of cars- will you be putting some hard standing round the back as well? The reason I say it is that, by the time you have your car, maybe two cars, one for towing, and one as a runabout. And then you have a livestock trailer, you might decide you need an atv trailer to go with that atv.... Maybe a flatbed trailer for muck, that JCB.... You kinda need more room than for just two cars....
Beth