This is how I had the Savic Mickey 2XL set up for our robo. Labyrinth house on right at cage base level with substrate round the outside of it so it's sort of underground (and a bit inside so it's not bare floor!). Shelf over it and sputnik next to shelf. Sputnik hangs over sharp edged cheese cube so it can't be fallen on if they climb bars. Wheel back left, flying saucer front left. Buried hay house centre - he liked to tunnel into that and hoard in it. Later added large cork log as a ramp instead of the ladder. He loved that - woiuld scratch away at the inside for nesting material and run over the top - used as a ramp up to the shelf and as a tunnel leading under the shelf.
On the bottom photo - I put a flat piece of cork in front of the wheel as a firm surface/step up to the wheel so he could get in and out easily - he made a very cosy second burrow under the piece of cork - it was a work of art! So cosy. Shelf good for harder heavy items as well - his sand bath is on the shelf and his food bowl.
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