Well, [member=208497]Natalie95[/member] - very good cautionary advice offered from others so far, but it all depends, I would suggest, on how much you need to feel "settled". Once upon a time a moto-home parked on a small plot would give one the economic (small) home freedom you are looking for, but that is no longer guaranteed without eventual hassle from "the authorities".
Some folk choose to park-up on a "caravan site" for a good part of the year, moving as necessary - of course one needs to invest in a decent-sized moto-home or towable caravan (allowing for large doggies) and have means of, or arrange for, relocation periodically.
BUT, if you can afford a small bit of available land (even if it does not offer all that you want) I would suggest you do not dismiss it lightly !! (I can't - nor anyone really - offer any thoughts though on the 3 bits you mentioned. Only you can decide on their usefulness/potential. )
landroverroy's post offered an interesting view on the affordability issue. However, while landroverroy's arithmetic might work on paper, lenders are increasingly cautious ! Again only you can really assess by contact with various lenders.
I'm not sure the above will help you to any useful degree, but I do wish you the very best of luck finding a way.