Hello,
I have a 6ft by 4ft shed with a 3 storey hutch they have full access to a wire cage over the window they can climb about in then there is a pipe that leads to a 4ft by 4ft run with a ramp to a 2ft by 4ft hutch on top, they have pipes hammocks ramps etc, all this cost me was the price of any screws i got to fix it all together, oh also petrol to pick the bits up but i didnt go far.
Its a great run and they have loads of room, i also got a couple of other hutches, 1 in use at the mo for my jill and her kits the other i have a hen sitting some eggs in.
I got most of this stuff off a web