Dont know whether it will affect your route chaps but the roadworks on the M80 approaching Stirling are a nightmare. About 10 miles solid, avoid if you can.
Have a great trip and hope the snow clears for Friday. It was glorious last week, but thats not much help to you is it.
Enjoy and I put one behind the bar for you all at Applecross, just mention my name.

Cheers
Chris