Hi, Im new to having hamsters and doing DIY stuff, but I saw an empty wine box and had the simple idea of doing this:
https://imgur.com/gallery/VbPgTRv
Drilled a hole in the box and several in the wood dividers, added some spare acrylic sheets that I had and voilą.
It has two levels connected by a ramp.
The round piece of wood can be put as a plug in its side hole when the hamster is put there. (Warning: No ventilation but the hammy will be there just a bit)
I didn't use glue, so I can disassemble it easily for cleaning or to put treats.