Converting under deck lizard room into home office....

We are considering purchasing a property on a sloping site that has a large deck and a bunch of rooms under the deck and part of the house, the main, large room is fully lined and has been used as a reptile breeding enclosure.. It's like the reptile house at the zoo, built in rock walls with glass, phase 3 power and heatlamps, it's got plumbing, a seperate kitchen sort of area and windows out to the rest of the property. It appears to be fully dry, they have put roofing, with gutters under the decking/ontop of the rooms.

I am not a lizard breeder but I do work from home and a deciding factor on whether we put an offer in is if we could convert this into an office space. It's a great size and outlook to the rest of the property but my main concern is ceiling height at 2m, I'm personally fine with this but I wonder about the whole habitable space thing and council approval.. But the space is already there.

The basic work required would be stripping all the the lizard stuff out, and repainting, possibly replacing the dry wall as it looks like it might be fibre sheets(asbestos) the room has a concrete floor which I don't mind(polish it?). I'd also like to put a toilet in and the space is big enough to accommodate that. Possibly also replace some of the windows.

Not expecting any of this to be cheap(and a lot more involved then what I'm saying above) We'll have a building and pest inspection if the offer is accepted but just looking for general comments on if this is likely to be doable?

I'm in VIC