1) I use water-based acrylics.
2) Therefore, I don't have a need for a fire-safe booth or a fan.
3) Therefore, I can use a pasteboard booth I've carved from huge pasteboard box, covered by wide strips of sticky tape.
4) Light is provided by two lamps.
5) the booth is protected from dust by polyethylene (or cellofane, don't know how it is in English) curtain fixed on the top.
6) I've made my booth from a box in half an hour. It's huge. It's very light. It's durable. If I'll ever need a fan, it can be adjusted. It costs nothing.
7) I'll be damned if I'll spend $200 on a fancy box.
8) If I need to spray something really flammable, like acclad, I do it outside.