Ah so thats where i fail. I only work on one project at a time, and yes there is a lot of depression inbetween waiting for parts to dry, orders to arrive.
So how many are the perfect number to work on?
Same as the optimum number of guitars/cars/bikes etc. N+1 to the upper limit of your significant other's patience.
FrankenLab Hand crafting guitars, because Death Rays are expensive.