No reason why you cannot grow enough for at least 90%.
Last year was my first full year. I have Cauliflower, Broccoli, French Beans and Butternut Squash in the freezer. |Potatoes in thick cardboard boxes from August that will last till middle of March. Used the last of the Sprouts today, would have had more but only 2 of 6 plants produced useable ones. Have enough Garlic in the shed to last till next crop. Carrots and Parsnips are a sore subject. A hole in the fence let Rabbits onto my plot (my fault), they ate two thirds of my crop! Prior to that happening I reckoned I would have had enough to last.
I did not get my winter cabbage in early enough so used the last of them in January.
Must plant more shallots this year.
This from one plot 14 X 15 Meters so with 3 plots and a freezer I would say it is doable.
I sow carrots in rectangular plastic boxes in the greenhouse in January. These can come out of the greenhouse when green house veg needs to go in. This year I have cabbage germanating on the window sill at home I intend to put these in pots in the greenhouse to try to get some early. Don't know if it will work.
We cannot sow peas direct as rodents eat the seed. I was also warned that pigeons will eat the plants when they are of a normal size to plant out. To combat this I built frames covered in chicken wire with removable netting on top. Then as an advancement on that I covered 2 of them in polythene with removeable glass on top (had it spare from putting in new windows at home) This way I can grow early varieties of peas even earlier. Would like to be able to freeze some peas but half of what I grow gets eaten before I can get them into a saucepan let alone into the freezer.
Anyway good luck.