I added some tent rods to hold my outer tent windows open.
I was concerned about tearing the tent fabric so I added some reinforcements to the corners (inside and out) that I made from orange iron-on patch fabric, then I carefully attached the patches to the tent with a heat sealing iron. I installed stainless steel grommets to make durable mounting holes for the rods.
I picked up some ARB window rods which are held into the extrusions with some simple support blocks that I 3D printed from ASA. The blocks are held into the extrusions with 10-32 GFC T-nuts.
Total cost for this project (not including shipping, sales tax, my labor, & tools I already own) was less than $60.
Window rods: $11.16
Iron-on patches: $8.99
Grommets: $7.99
GFC T-nuts: $28.43
ASA filament: ~$2.00