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Here is an attempt to draw this thing. At top, it will pin into a pad eye
at the end of a receiver plate/saddle coming horizontal from the beam. At
bottom, it will rest entirely on washers on a plate mounted to concrete.

From the top, at one foot down, the horizontal goes out. The diagonal in
this drawing is not to scale, as the top angle would be much greater. The
hoist's outer attatchment will go about 2/6" from the vertical.

The diagonal would be the square root of 10 in length.

Each short horizontal standoff would be about a foot long with a pad eye.

I anticipate that stability will be from a solid mounting at the bottom, and
a beam saddle with extended baseplate to make a pad eye for the top
attatchment. The middle standoff will just stiffen it up a bit, and help
keep it straight when I swing it in towards the porch.

HTH. These things are hard to describe in words so as to communicate
exactly.

Steve