Shelf on the bottom:
Attach cantilever (is that the correct term?) brackets back at 45*ish so they hold on the top of the hatch, where the top of the extension starts.
From about the middle of the "arms", extend back to the rear of the "tray", making sort of an upside down "y" shape. Add L brackets to the lower sections of the extension for added support of your new "tray" area.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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