Re: New soon-to-be hedgehog owner looking for housing advice. :)
You should consider a larger cage then. I have a tommy 120. the CSW is pretty large, but amazing. If you want a second level, you should have walls that run to the top of the cage on both the level and the ramp to prevent falling. You also need to consider heat getting under the second level. One of the links I put in was cage setup examples. There are a lot of "lofts" to look at on there.