This has been one of my projects over the last few days.
The loft was disassembled and moved to the garage some weeks ago. I prepped and stained it, added a purchased 4' swing and chain Made in Ohio, plus other hardware. I bought the custom cut 82" beam it hangs from at Home Depot on Mall 205 (it fit in the Subaru). My solution to fixing the beam in place: three brass braces at each end, two atop, one under, these purchased from Divison Hardware.
The finished swing now sits in the back yard, facing the Mother Mary statue.