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After those two supports have been fitted, I used a piece of cardboard to get, as built dimensions for plates that would extend out from the upper longerons and attach to both the supports and the main fuselage cross member. The plates form a shelf on either side. On the left side the shelf will support the ELT underneath it. The first two pictures show the plates dimensions laid out on a piece of .063 material with the initial cuts made with my sabre saw.

The material is them bent and fitted into the fuselage for drilling as shown in the last two pictures.