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As I were using 10mm booms, this is the size that will fit.

However, the design is as parametric as I was able to make it, so you can change the "boom_size" variable in the "modified_tricopter_frame.scad" file to make your own (you may need to change also the hole positioning by changing the "hole_position_along_X" and "hole_position_along_Y" variables).