Guinea pig huts caves for indoor run (Ranmoor S10)

home made from black HDPE and rivets. Functional and long lasting, they have had 10 years of use. I can't say they are pretty but our guineas were happy in them for years on beds of hay, which they ate too.
Internal sizes:
Single room hut 24cm x 19cm x 18cm high
Single big room hut 43cm x 25cm x 18cm high
Double room hut 2 x 46cm x 24cm x 18cm high
And a roof to attach to the side of the run for hanging out under safe from eagles 55cm x 27cm