Just stop worrying about a 'deal'. The whole thing is just a political smoke screen designed to disrupt the withdrawal process. There is already a deal. It is with the WTO and it's high time we told Tusk and his fellow eurocrats to back off so we can focus on our new trade partners.
That is if you believe the political class will truly enact the referendum result. They don't have to. No law says they are compelled to.