My wife and I have a vegetable garden going on in our backyard. We planted carrots, cabbages, and green pepper.
We grow different types of vegetables each year, and the nice thing it that we give our rabbits some of the greens also.
You can use also use aspen, or a combination of aspen and other hardwoods, such as hemlock, spruce or fir. Hardwoods come in pellets, chips, shavings, or fine shavings. They are effective, however tend to be hard and splintery.
That was a small one because remember rabbits also need some space to move around and exercise. I'm sure the larger one you built will be good enough for him.
All the best!
Another piece of advice is that the sides of hutches also need to be water proofed. Coating will wear and needs to be reapplied every few years, more if necessary. This will stop the damp entering the hutch and also protect the wood from rotting.
If you are treating the inside of the...
Adding to the above also design the house in a way that fresh air can get in when its very hot, you don't want your rabbit to die from too much heat. The rabbit house can have two rooms, one room can be open with windows whilst the other room can be closed to give the rabbit more privacy.
Although the above advice is good I also suggest that you start of with a few rabbits so that you get the hang of taking care of rabbits. Once you get used to your rabbits you can then add more and buy new cages. Starting some will also help you save money so that you don't spend on something...