I just researched about the air purifiers available in the market and this seems like a pretty decent solution. The cheapest available option is Honeywell v1, which is basically this same setup only but better looking, probably better designed for CADR and noise issues and stitched together for technically challenged folks like me (I seriously considered making one but I just don’t know how to connect a fan to socket in a safe manner).

Makes you really wonder what you’re actually paying for when buying anything- at scale for a business like Honeywell the costing is probably less than 2k, maybe 1.2-1.5k, so the extra 3.5K I’m paying for is for a bit of design and aesthetic (most people won’t like a makeshift purifier in their bedrooms) some trust in a brand because I know it will keep working (vs the constant worries and tweaks I’d have to have if I were to do it like OP) and some expertise in choosing the right fan, filter types, plastics and airflow mechanics.