One thing you haven't mentioned much is trees. With 2/3 of an acre you should be able to have 20 or so trees and shrubs producing fruit and nuts - if not more depending on how much you want to espalier or otherwise prune. Thinking about it, you should be able to manage more. Our previous block was 1/3 of an acre with a large house on it and we had a dozen conventional sized fruit trees. If your house is the same size as ours was, that would give you the whole 1/3 of an acre to play with.
Me? I'd look at 3 - an early, mid-season and late/preserving variety - of each fruit you're likely to want. Apple, pear, peach, plum, apricot - 3 of each of those gives you 15 trees. Though if you're space saving, you might do some with planting 2 or 3 trees in the one 1-metre hole to restrict size to save yourself some pruning for size control/ picking access. Or you might prefer to have them in a neat row so you can run a chicken tunnel alongside / between them when it's time to clear up fallen fruit. I'd also find a spot for a quince - because the blossom is spectacularly beautiful and you can have a little gladdening of your gardener's heart for a few weeks, especially if you have spring bulbs beneath it which flower at the same time. And the fruit makes the Best Preserves Ever. The smell of a quince pudding or crumble baking on a cold evening is an absolute delight.
Some people plant fruit and nut trees as a fence - a mere 1 or so metres apart and let them fight it out for room to grow and access to sunlight - but we don't have a problem with sunlight access in Australia so it might not be appropriate for you. Though I understand you can do that with things like hazelnuts and gooseberries. I realise that it would be hard to grow pistachios or almonds where you are, but you should be able to find an appropriate corner to plant a large tree like a walnut without taking up too much space - seeing as walnuts make it impossible to grow anything near them, perhaps plant one near the edge of the block where it will also shelter the henhouse or other outbuildings and not impact veg growing. Or you could plant it in a non-productive area of the block and gradually give up on trying to grow grass, flowers or shrubs near it as the root range gets bigger.
I'd also plant at least 2 cherries with a garden that size. And you
can save them from the birds.
http://www.woodbridgefruittrees.com.au/woodbridgefruittrees/articles/171-spanish-bush-pruning.html Some of the other pages on that site are worth looking through on an idle evening.
Remember if you want self sufficiency in stuff like fruit and nuts, you have to grow enough for all the fresh eating and cooking you want
as well as for drying and other preserves. You'll never starve with store cupboards full of sauces, preserves, jams, chutneys, pickled fruits as well as the more conventional pickled vegetables. When you're growing stuff yourself you can also turn items that would be waste in a commercial orchard into good food. Pickled green walnuts and preserves made with windfalls or immature fruit that you've picked for thinning turn apparent loss/waste into delectable nutrition. If you have nuts and late-picked, long storage apples and pears and melons in a suitable outbuilding or cellar of their own you'll have fresh produce for much, much longer than the growing and harvest season.
You mentioned a greenhouse, have you thought about dry storage for all your non root vegetable produce? And you need to plan reasonably well for such storage to be near the house and/or to have a suitable inside area to keep a few days' supply. It's not much fun having a couple of dozen pumpkins or melons or kilos of nuts and pears in storage if you have to brave a howling wind or a downpour to get to them on a cold evening. And there are airflow requirements to the design/layout of such a cellar or outbuilding if you want to store your late season apples and pears along with other produce. You have to maintain cool temperatures
and ensure that any ethylene produced is steadily wafted away
and that you don't get aromas from other produce mixed in to spoil the taste - of fruit especially.