Hi Mike,
I am also wanting to do the trio of Heavies and I am currently 70-80% through build the FM Halifax OOB, I also have two Tamiya Lancasters and you guessed it the Sanger Sterling!
Can I ask where you got your plans for the Stirling and whether you would interested in selling, swapping or trading for a vac canopy once you have finished your master?
I will be watching this thread with great interest as I am hoping to dig into the Stirling during my Christmas break.