As said above, if you have good shade, ventilation is a non-issue.
Perhaps it would be better to spend money on aluminet and a support system, then just get a cheapo tent you can stand up in. Paint the open mesh or cover it as mentioned above. I've had a cheapo Coleman out there for 8 years and not one pole has ever bent.
I don't even like mesh on the closable windows, and so I just cut the mesh out. No bugs out there and the mesh stops all breeze below about 10mph.
I used "Fabric Fusion" hot melt velcro (more expensive than glue on type, which fails easily and sewn on is too pain in the ass for me) to connect the window coverings intimately with the tent body, and playa doesn't make it thru the velcro. It could be used for overhead mesh, but most tents these days have the entire top as mesh and the velcro would be expensive.
One can get longer lengths than the pic at WalMart etc...