I was told the minimum according to the " Royal Society for the Prevention of Cruelty to Animals (RSPCA): 'As large as possible'. No minimum given due to lack of evidence (used to be 70cm x 40cm)".
I tried to give more than the ferplast by connecting several cubicles and giving him 20cm depth of wood and paper substract for him to nest (which he does
)
And now you say they need continuous unbroken when I thought that it wouldnt make a difference because their natural habitat is exactly some chambers (or cubicles) connect by tunnels.
Again, thanks for the feedback I will try to think of further improvement or other solutions