"Highly skilled workforce" - seriously, you are having a laugh. Have you seen the Curriculum for Excellence and the very, very low expectations it has for Scotland's youth? And you do know that many of the highly skilled industries (Oil?) are staffed from across the UK and, indeed the world.
How can you argue an highly skilled workforce and then, at the same time, want immigration, presumably of the highly skilled?
Many of the most skilled are in industries that simply will not survive independence - banking? financial services? They will remain in a severely curtailed form and many will have to leave with current jobs or, in future, in order to secure promotion. A good friend of mine was in charge of a bank in Scotland (being vague here but true) and wanted promotion. The next step up was a country in Eastern Europe that we think of as being poor. Scotland is tiny.
Many, many tourists (I know, I am in this business) come from the UK and will struggle to finance a holiday in an increasingly expensive Scotland which, ultimately, will be overseas and where there are ongoing and acrimonious negotations with the UK.
They will go to France which is closer. Or their "staycation" will be in Wales or Cornwall, not Scotland.
Textiles - Harris Tweed? Yes, a very successful small industry.
Mining? You are having a laugh?
Drink? Well the Whisky industry association is against independence and I would imagine they know their product and markets.