Right, this is a bit of an area of expetise for me and I have made a couple of hutches, I will make another one soon as I'm never happy with them...
You need to make the hutch fit where it is going to go, if it's free-standing in the middle of a field you will need excellent weather protection to stop the rain blowing in, or glass doors which might not look too good. Acess is really important as is a reduction of dirt traps.
You can use B&Q pine and their value T&G interior cladding if you paint it well, I have used Cuprinol Garden Shades which is easy to apply and they haven't chewed it, that said, they have plenty else to chew on normally.
The idea flooring material is something that you can change easily without needing them to go to a hotel for the weekend, I am going to build one like this soon and for the flooring I will use grow-bag trays, the large plastic trays you can get from a garden centre for about a fiver each, then you can fill a new one with paper and sawdust outside the cage and just swap them out. Rabbits always go in the same place (mostly) so you can put in a separate litter tray which you change every few days, the droppings and wood chips are like speed for a compost heap, the day after adding them it starts steaming!
One thing not to neglect is height, even a small rabbit needs a good 15" floor to ceiling, this reverses for the bed area, there small is good, if you put a box in that is over half the height of the hutch they will probably spend more time on top of if than in it. Sections of drain pipe are usefull play items as well as bedding locations.
Maybe I'll post some WIP when I start on that job
Aidan