Something's weird here. I expect the carrier you need is a No.23. It's the typical wood one you see with handles at either end. The one in the diagram is called a No.3 and looks like a smaller, less complicated board than the No,23, yet it also shows the waterproof cover No.5 which is used with the No.23. Is it really a No.3 they mean? Or is is a No.23 and they've simplified the drawing? Perhaps so because there is no indication of the corner notches for the No.1 mounting brackets.
The real test would be to check how much space you have on the table. A real No.23 would appear to be wider that the "No.3" shown.
I may have one of those ZA wha-cha-macall-it variometer mounting things.
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