Spitfire mkiv - softtop mounting plates

[charlie8]

Hi

Got to the final stages of the resto and now onto the softop, which was in pretty bad shape. Ive 'de-robed' and got the frame in good shape/condition, however i dont have the mounting plates. Ive sourced a few pics on what i mean ( showing one here ) and were going to fabricate via these visual ratios/dimensions, but its always very hard and prob have at best the fact that it goes over the 3 holes in the b-pillar as a start, but holes/height on top end look critical

Ive searched this to death, although prob comes down to the correct terminology , but posting here if anyone would be so kind to trace around their own and measure up for a template of each layer. All I can make out it is that it appears to be dual skinned and looks like about a 3mm/11 gauge depth on each.

Any quick sketches very much appreciated