If you like this unit, buy the pro assembly. There is a lot of parts. I started with the directions. On the first cabinet you have to suspend the supports to attach them.i set 7&8 on the side and the unit fell and the cam shaft pulled out of the wood. Thinking it is wood I figured I could just drill a hole in it and put a screw. It actually isn't wood it's a composite. When I drilled it split. The whole top unit is useless now. I wouldn't trust any weight on it.if the bottom doesn't work without the top, I've wasted a lot of money. it is disappointing that they called it wood.when.it is composite .