Aaah small matter of work gets in the way [sigh]
Our pigs have my DC old playhouse (one of those Swiss Chalet types) IIRC it was built when my DD was 2yo, now she's nearly 12 
The floor is wooden (and slightly raised which I was glad of in the flooding we had this winter). DH stripped it back and painted to about 2' on the walls and the floor with guinea-safe paint.
I put cardboard on the floor +newspaper. In the haybox I've got a huge rubber carboot liner that I bought from Costco and some smaller rubber car-mats . Have to make sure they are out of reach.
You might be able to get a lino offcut that would fit the base, and you could take it out to air it (and you wouldn't need silcone)
I did think about putting a hutch in the Playhouse but decided just to give them the whole floor. They have a big haybox with a hinged lid (made from an old bookcase) and they did have a ramp but never used it, so we removed it.
DH put a barrier across the door (about 3' high, fixed) and there's a screen door half wood, half reinforced plastic coated metal mesh + fine fly mesh.
Ventilation is something to think about, the wooden houses can get really hot. One window can come out and the inside is reinforced (wood, the metal mesh and the fly mesh) that is secured inside the pighouse.
Light- (no fun scooping pooh in the dark
)
Heat- heater, Snugglepads
Fan- essential to summer, GPs can get heatstroke very quickly.
I;m trying to convince DH to build a brick walled run at the front or side but I've no idea how to attatch it. There are those Rabbit Run tunnels and a catdoor stle doorway (would have to cut a hole in the wall)
If I was going to make our Pighouse perfect, I'd move it up the garden. At the moment it's in front of the garage (I store their clobber there and there's the electricty connection) but it would be nice not to have to totter down the path (ankle deep in water in winter, crushing snails just now
)
Your pigs will be extremely spoiled 