Hi, It sounds like you're taking this seriously and doing all the needed research which is good. I have 2 indoor rabbits and they're amazing pets however they do cost a lot - especially in hay, we use Wilko's timothy hay atm which is good and our rabbits like it but honestly buying in bulk from a local hay farmer would work out a lot cheaper. Also as rabbit's cannot vomit it is recommended to brush them to prevent hair balls - this is crucial in the summer months. I have heard it can be hard to bond with outdoor rabbits due to them being outside but if you spend time with them everyday this shouldn't be too much of an issue.
I would also recommend you research about fly strike and how to prevent it - it really scares me and i think all rabbit owners should be aware of it. I too would also recommend joining a rabbit forum, in case you need any advice/help with your rabbits, I'm a member of the rabbits united forum although i only look/read other people posts
. Vet bills can be costly (we paid nearly £200 recently for dental work) but if you're prepared for that than it shouldn't be an issue. I just wanted to wish you good look and also link you to a website i used for all my rabbit research - it was really helpful, especially with its covering of hutch/cage size and food
Rabbit Hutch/cage Size Guide - Minimum Requirements - hutch/cage
Rabbit Food Comparision - Brand, Type, Nutritional Analysis - this page really helped me figure out which food to switch my rabbit onto as it has a chart at the bottom of the page - i would also recommend you look at the other pages of this website - They're all helpful
I hope this helps in some way
I think you could make this work, if you're willing to make sure their hutch is secure and predators cannot get to them.