I think a platform that sits on the base might be better than one that attaches to the poles
You would just need a piece of untreated kiln dried pine wood and some square wood dowels for legs. A diy shop could cut a piece of wood exactly the size you want. A platform is a great idea.
I would make it about 21cm tall so you have lots of room for substrate under it.
Some people make them out of Ikea knuff magazine racks too and stick little dowel fences round. If it's for a syrian the holes need blocking off on the side of the knuff.
https://www.google.co.uk/search?q=Ha...w=1252&bih=554