I did mine a few months ago.
A couple of caveats -
I bought the straps from mrfatboy here - they were perfect - so I can't comment on those from Authentic Classics. But the padded portion went toward the back, soft side up.
Another thing is my car is a late 280, so I can't comment on all the differences for a 230 - there are a few, I know.
One little detail which I didn't do is to pre-assemble the top (lightly tacked on) and erect it with the straps attached only at the front, and just hand-placed in position across the frame arches toward the back. That way you can line up the frame pieces with the seams in the top, and then mark the correct locations for the straps to mount on the frame. Then take everything apart and attach/glue the straps to the frame. Otherwise you could end up with the frame not precisely lining up with the soft top seams. Ask me how I know
Good luck!