If you want to do your own trade deals, you need different tariffs & regs. If you need those, you need a border. If you don't want those, there's no point leaving the SM & CU.
We can't have a border
There won't be a choice because we can't have a border on the Island of Ireland
Brexiters can gnash their teeth & slap their heads but we have a unique situation & a long standing commitment
Brexit needs borders to make sense
We cannot have a border in Ireland
So Brexiters cannot have a proper brexit
And they all know it