Hi Robert. Yes it can be a real fiddle working out how to support wheels and have deep bedding! I've just had similar things to work out, setting up a cage with deep bedding. It sounds like you've gone for split level. As the others say, it could be better if the sand area wasn't a full half of the cage, so there is more substrate. Some of that depends how big the cage is as well. It does make it easier not having to have very tall platforms for the wheel and sandbath. Maybe you could have one third sand area, two thirds substrate? But then I guess the ramp would be very steep. What some people do is have a hole in the divider fence lower down near the sand area, and a tube going through that, from the sand area up to the bedding area - you can have that any angle you want and it come out further along the bedding area. Then maybe have a hide the other side of the fence, further along, with a smaller ramp on that (as hamsters have a habit of trying to get over places rather than use the tunnel! That way he could get to the wheel area without jumping too far, but to get out again, he'd need to use the tunnel. Does that make sense? Or would cutting a hole in the fence down the bottom be difficult as well?
The multiroom house really should be supported on legs actually, as if they burrow under it, it can sink and potentially squash them! That is actually easier than working out platform heights though because the house has a solid surface at the front and sides. What I do is just glue thin dowels on the front and sides of the house. Two at the front either side of the entrance, and one at each side nearer the back. The dowels get glued to the full height of the house so have plenty of surface area to adhere to. Elmer's wood glue is ok to use (depending which version it is - it needs to say non toxic).
So if you glued on 30cm dowels and the bedding was 30cm, the house would be mostly submerged under the bedding. But if you glued on 35cm dowels it would only be partly submerged

. I've got a photo somewhere. Recently, I did this for our Robos cage, and only had 30cm dowels so I just glued them part way up the front and sides of the house. My bedding is about 27cm deep so the house still sits on top of the substrate. It's better to glue them the full height of the house though, and have something like 35 cm dowels (if you have 30cm of bedding). The house is on the right. I also really struggled having platforms with tall legs! But that was because it's in a cage with a sloping base.
