This is to be a quarantine facility. You will need to apply to the local Council for a building consent and the building consent will need to be the same as the plans approved by MPI. The walls, ceilings and floor will need to be capable of being cleaned without damage to the surface. This is not a shed out the back of the house with fish in it. When I built mine it had a 150 mm concrete floor with heaps of steel in it to take the weight of 4 tiers of tanks and 100mm of polystyrene under the slab, The walls and ceiling were lined with coloursteel sheets with the joints sealed with RTV and batts and sisalation for insulation. If you use sisalation it needs to go on the warmest side to avoid condensation. You will probably have to construct an ante room and construct the floor to retain a good percentage of the water content if there is a major accident. There is no point in getting a building consent that does not match up with the requirements of MPI or you are just making problems for yourself. You need to consult with The local Authority (and Regional Authority) as well as MPI so you can find out the actual requirements. We can offer suggestions but are not the approval authorities.
Agree with post above.