Here you can see the tail boom positioned on the mounting flanges. If you look closely you can see the plumb hanging over the centerline at the bottom of the picture. Even though you can't see them in the picture, there are three plumbs aligning the frame with the tail boom.
You can see how the tail boom is supported by a strap hung from the ceiling
The mounting flanges are positioned over reinforced mounting pads located on the inside of the tail boom

Tailboom geometry is critical. It is positioned 23" from the rear square tube and 8 degrees slope from horizontal.

 

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