Your existing model is more accurate than that.
There is only one decent Viscount model
That was the Hawk 700 reissued by Glencoe.
Even that has inaccuracies around the engines and nose and the portholes are a little two small. But is is a good one.
I made several with the different cockpits portholes and prop blade shape...alas all gone now.
If there are any details you are stuck for I might have pics I can scan.
If not Fraser :dance:
I'm sure one of us will sort you out

ATB
Garry