Since the 3-views are crap, I will combine the various 3-views and overlay them on the available photos to get the right shapes.  Also, since the Monospar was a UK aircraft, all measurement must have been in inch and we will round up/down to the nearest imperial units. i.e. 1/4″, 1/8″, etc.

I will start with the rudder.

Comparing the three-views with the photo it’s clear that:

1. The lower edge of the rudder is flush with the ground when the plane is on the ground.
2. all curves are circles, with the exception of the top leading edge.

So, now we can draw the actual rudder.

This is going to be a pain of a project.