When we first had pygmies, in a back garden, in a modified shed, we also had a platform and usually at least one slept on it. The floor was wooden and we managed to scrounge some old kitchen vinyl flooring which we put down and covered with hay. This worked really well and when we cleaned everything out completely, a quick hose down and after drying there was no smell. They had been in there for just over a year and cleaned out regularly of course but this definitely worked. BH also screwed some scrubbing brushes to the fences at strategic places which they loved to scratch against. We used hay for bedding as they are so fussy about what they eat that a lot ends up on the floor anyway and as there was no cost difference it was easier just having all hay.