I glued more craft sticks across those support beams. Then at the ends glued a pieces of a wood dowel I sharpened the end of -- this holds the wire mesh (I think it was rabbit fencing) in place. Then more chunks of wood & metal were glued to the mesh to act as the walls.
The base was covered in a mix of coffee & tea grounds. For rocks I went to the Home Depot & picked up some of this planting bark.
And used a sponge from a blister pack to give a more varied color.
The ladder support pieces are bamboo skewers that I drilled pilot holes in with a pin vice and the rungs are toothpicks.
Some more bits & foliage and there you have it:
If you have any questions, please ask -- I know I'm sort of rushing through these.