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What I do for a home spray booth is go dumpster diving at a new home construction site and get one or two of the long cardboard boxes that vinyl siding comes in. Take the boxes and tape them together end to end. Tape a little bigger square cardboard box to one end of those boxes and cut a round hole in the side of that box and tape it so the hole is affixed to the side of a squirrel cage fan out of an old furnace. Then cut several smaller holes in the siding boxes along the other end. The squirrel cage fan will be outside of the spray booth and the other end of the siding boxes with the holes will be inside the spray booth.
This will pull the paint fumes and mist in through the siding boxes and out the squirrel cage fan.
The motors for these fans are outside of the fan cage so fumes won’t pass over the electric motor reducing the chance of a fire or things going boom.

For the spray booth I use painters plastic on the floor and draped from the ceiling forming the four walls.
The plastic is so light that painters tape usually will hold it in place. My shop has exposed rafters so I tack it in place with staples to hang it.
With the open rafters it acts more like a down draft spray booth.
Works well for me.