...in which case, the shed would probably be too large - the pigs won't mind a bit, but they'll make a bed in one corner. Then when they wake up they'll leave their bed in the corner, and once they've left it, they'll pee and poo quite happily, but in that size shed they'll still be inside, so you'll get smell or urine, and poo picking as an additional hobby !
As I say not a problem for the pigs !