On my layoff, I have been building a 10x16 stick built greenhouse for my wife. I have nearly all of the footings, walls, roof trusses, and purlins mounted, along with the window, and the door. I still need to cover it all with Tuftex polycarbonite panels.
https://www.google.com/search?q=lowe%27s+greenhouse+panels&rlz=1CATTSD_enUS813&sxsrf=ALeKk01AzVPdDAlTbMgUfOMN-QMS-FeTOA:1588126822200&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiuquG4yYzpAhXPHM0KHU9jDtIQ_AUoBHoECAwQB g&biw=1536&bih=762#imgrc=IuprU-4TyF1u9M
https://www.instructables.com/id/DIY-GreenHouse-Build-Solid-Structure/
The greenhouse we had last year was a cheap, metal tube frame unit, with fitted plastic. I think it was 6x10, and did the job for the Summer, but several storms (strong winds ) wrecked it, and nearly blew it away.