Well after building a overhead for a good friend it was time to build my own. Second time its more easy but still a big work with all those cables. The wiring could be optimized and more structured but it's very seldom that I need to make any maintenance on it. 

When you have made the wood structure remember to place all the panels on it with the switches attached so you can see where you need to cut in the structure. There is a big difference if you use small or big switches. 

Frame with measurements