I made this out of recycled jarrah. The rails are doweled to the end brackets and through the the centre bracket to each other.
The back brace is bolted through to the wall using knock down bolts, to make this easier I drilled the centres out of the wall plugs once I had inserted them.
I have 3 daughters sharing the bathroom now there is 1-2 towels on the rack but still just as many on the floor.