make the floor of the hutch out of two kinds of mesh - a strong rustproof (stainless is good if you can find it) 50mm mesh with a lightweight galvanised mesh over the top of it. Provided you keep the bedding topped up you won't have to clean it half or even quarter as often. The droppings and urine drop through the mesh on to the ground, where they can be scooped up with a shovel and put on the compost.
It also keeps the bedding a lot dryer (because it's ventilated) and you don't get the bottom of the hutch rotting out.
Rabbits like both seclusion and moving around, so a hutch that is about six feet by two feet by two feet high is good - angle the roof to take the water off the back. Make a seperate sleeping compartment with it's own door, so that you can reach in and get the little critter out if she or he decides to go shy on you.
And (this may have been said already) check their ears for soreness regularly, and be prepared to do a bit of barbering around the back end if the rabbit is long haired.