poorly thought out design, no place to mount mobo or anything else. that's not a rig frame. at the very least its only a gpu holder at best. good fire starter though since you used wood
What's funny is people do this type of rig before you yet you pick on him. So what makes difference with him and the others?
Motherboard can sit on the cardboard. I done it. I push the room temperature 110F and nothing burned. 8 months in a row. No issues with metal racks. I don't waste money on those highend rigs eventually I would throw it away if I'm done mining. At least with that rack I could reuse.
Wood or not wouldn't make difference preventing fires because outlet and home wiring and the carpet is like 90% and wood is just small part of the problem. People done rigs on wooden frame.