Wow! What a difference just using the numbers makes

Here are the numbers. Three of them were illegible in the Avro drawing. I’ve replaced them with the closest fit I could produce. The numbers are in inches.

I produced the curve using a spline and a nice Interpolate function. I used some trig etc to produce the inner profile at the correct distance from the outer profile. Here is frame H superimposed on the Avro drawing:

What a difference following just the numbers makes! I wouldn’t have dared depart so far from the Avro drawing without all your comments.
Mike

PS: It’s also solved the problem point 2 in my first post in this thread. Now the bottom of frame H meets the nose profile curve very nicely.