Hi
All I did was got a plastic tray that is for storing clothes under the bed with crazy clarks . I put some soil in the bottom say about75mm and then i bought 2 of pieces turf from bunnings which they sell on saturdays, and put that on top of the soil I then put with my puppy, he after a couple of times with the help of us sorted it out and the transition to the back yard etc was easy, cost about $20.00 dont forget to water the turf .