Really? Nothing? Think you're the one who needs to research a bit or has it escaped your notice that your shipyards were just this week given a multi billion pound contract to build ships for the royal navy, can you really see England awarding those to a foreign nation in future? Or indeed those contracts staying in Scotland should you break away?
All your central government funds come from westminster, those oil and gas fields you are relying on are licensed out for decades to norwegian, us and english companies (including the undeveloped fields) and if you try to rescind those contracts then the support industries that places like Aberdeen rely on wont be given those contracts anymore
The banking industry is up the spout all over and the support centres are being out sourced to places like India so the 2 main industries in Glasgow aren't exactly booming, your government is trying to bring in a minimum price per unit on alcohol (despite the fact its against european competition laws) which will royally shaft distilleries and breweries
There is no real fishing industry left anywhere now so thats not to support you especially with the Scandinavian countries fishing at will in your fishing grounds (and you wont have a navy to police those waters)
Cant really think of many more industries you have that could provide national income
Anyhoo as i said, doesn't bother me either way but you guys need to seriously look into your potential infrastructure for yourselves before you vote and not just take the word of some politicians who aren't exactly known for their honesty