I think the porta cot idea and legal advice are good ones
I hope you get it worked out OP
OP have you been through mediation in regard to this?
Perhaps the best course of action is as Lovemyfam has suggested, talk to him, but do so in a controlled environment so he can not intimidate you.
Contact relationships australia - They will give you heaps of advice and help FOB understand what is in bub's best interests rather than allowing him to think you're just being difficult for the sake of it.
A lot of people have preconceived ideas in these situations without really knowing how things work. You need to arm yourself with KNOWLEDGE and FACTS - good luck and feel free to PM me if you need advice from someone who has recently been through this sort of thing.
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