I dunno, I only earn a pittance (£400 per month) and only do that to pay the rent. My land i now get rent free as I help my aged neighboring farmer and his wife, food is either grown or foraged. i do buy in some animal feed yes, but then when fat lambs are sold or kids etc that pays for the feed.
Rabbits are really easy to look after badly
They can be kept in tiny areas, but it is neither humane nor decent to. The minimum guidelines are a 6 foot by 2 foot hutch PERMANENTLY attached to a 6 foot by 4 foot run NO WIRE FLOORS. John Seymore was a legend perhaps but he was no pioneer of rabbit husbandry, I am still re educating people to this day
You have a good amount of land, but I would be concerned with so much tied up in crops that cattle might poach their area in a wet year like this one. Have you though about starting with goats instead?
Is it possible to be self sufficient? Yes I believe it is though it will be the hardest work you have ever done! However the strive toward self sufficiency is possibly also the most empowering thing you have ever done.
I am not self sufficient, I would love to be but if I want to rescue rabbits I have to keep this place I live at currently. For that I must pay rent, and for that I must work
I reckon I would be 80% there otherwise
Whether you will be 100% self sufficient only time will tell, but I bet you will have the time of your life trying
Good luck to you!