On the "failed" currency: the euro was launched with a value of 69p in sterling; it is now worth 77p. Where is the failure?
On the failed eurozone: it grew 0.6% in the first three months of this year. The US economy grew slightly more - but on revised figures. Hardly a failure.
There have been economic disasters in constituent members of the zone: the Republic of Ireland, Spain and Greece, but these have been caused by reckless populist governments rather than the existence of the euro. Those failures have been more than counter-balanced by Germany, one of the most successful economies in the world, and seven other eurozone nations with a better government debt to GDP ratio.
On immigration: no Brexiteer has said that they would stop all immigration. Indeed, Tim Martin of Wetherspoon's has admitted that around 4% of his staff are immigrants, and he wouldn't want to stop them coming to work for him. Leaving the EU would not make any difference to the distressing casualties at sea, which are emotively used by Brexiteers as an argument. What is needed is a reversal in the cuts to the coastguard, together with an augmented and upskilled Borders Agency - but of course the latter steps need money, and Michael Gove wants to give up VAT on fuel bills as well as spending £350m/week on the English NHS. This is where we came in.
* I would add protection from dismissal on grounds of age and from being forced to work excessively long hours.