in this video we are making hudge screen from regular throw projector very cheap just with simple mirror.

if you are planing increasing size your light power will get lower but you can get bigger in dark room

Flat Looking Cheap and Easy Apply Mirror
https://tr.aliexpress.com/item/100500...

Some Plexi Mirror Examples from 5-10$
https://tr.aliexpress.com/item/100500...
https://tr.aliexpress.com/item/100500...
https://tr.aliexpress.com/item/100500...


Foldable Mirror for Cheap ( Look for Bigger Size )
https://tr.aliexpress.com/item/400014...

Mirror Style Films
https://tr.aliexpress.com/item/100500...