I know there are kits for sale out there but the price didn’t seem worth it. Here’s what I came up with for the following cost:
Total: $31 (± shipping)
Only changed I’d make the use of bowed window rods to give them more rigidity to keep the awning flap more taught and stronger in wind. Note that the hole these slide into it oblong, not circular so I hid both sides (180-degrees) on the belt sander briefly so that the bearings slide in and are locked in place (cannot spin).
Also, if you want to avoid the sleeve bearings, you can simply shove the window rods into the hole in the aluminum machined block, that worked fine for me but I’d worry about damaging the material long term.