The Omlet hutches are really small (and £££)
I have just one older piggie girl now , she will be kept indoors apart from going out in the run when it's nice.
Mine had a wooden playhouse that DH adapted for them. I put a rabbit hutch (on the floor , legs cut off and a door cut in the end) on one side , and a big plastic box (one for holding garden cushions, two doors cut) in the other side with a divide in the middle when I had 2 groups (at one time we had 2 sows and a Boar+2 sows groups)
But they came inside for winter nights , and out to their cosy shed by day time
We bought some Bunny Business runs and put some hidey boxes in .
Our plan is to put the rabbit run inside the big run for our sow .
I would use the Omlet inside the big run so they have a place to hide , but only in summer .
If they feel cold or unhappy they'll just hide away .
I've never kept rabbits but i love piggies and I love the fact they are noisy, greedy, totally dependant , quite vunerable , don't do anything strenuous , don't bite (by and large) and are very cuddly .
Guinea pigs need a lot of space (rabbits need more though) . In Summer mine would go out into their runs , they had shade and we always made sure there was a nice breeze where possible . Sometimes they couldn't go out till late afternoon. The Pighouse was always shady (its under a tree) , good ventilation.