I only have top soil as substrate until atleast Friday so it will have to do for the next few days. It's fairly dry on top near the lamp but just underneath the surface is very damp still which is good.
I'll post a picture of Montys table
Your enclosure looks great James, and I'm thrilled to see someone using a large enclosure.
I don't see a water dish. Is that the thing that is partially hidden by the lamp in your picture?
You will have a continuous battle trying to keep humidity and temperature correct, and your substrate properly damp, with the wide open top. I would add a humid hide, so your tortoise has a retreat to go to and get away from the dryness.
I would move the hide that is up against the wall away from the wall. Russian tortoises are escape artists, and your tortoise will climb that hide and be up and over the wall before you know it.