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[Vicmorrow]

Sounds like a top enclosure.
I built a slightly smaller one and secured a nice thick piece of bamboo from end to end about 6ins off the ground. I sealed and varnished it, which I reckon is safer to keep the crawlies out and imo it looks better. My big bredli stretches out on it at night.
For substrate I use fake grass, with newspaper underneath, which looks great and is easy to clean.
For high hides I reckon a bird breeding box is good. You should have no trouble attaching it and my smaller bredli love hiding in them.
Good luck