Okay after drowning in all the great comments of which I am very grateful btw, I made a new piece of the schematic (just one mosfet but the principle is the same) leading to this:
Did I pay attention? 
I still have to check that aluminum thing (my lack of experience in this). But I also need the thicker copper (I think to handle the current throug the traces) withoug creating 10 lane highways on the PCB
