wel babyleggs it is quiet simpel.
firste you have to decide what way you like you switching.

i my case, the volume pot is a 500Kohm pushpull.
the leads of the L500Xl go to the switch at the botton where you make a serial/parallel mod.
then you follow a normal 1 volume 1 tone layout but change the tone so it will be like the one on the drawing above in this topic.
so you have to adapt another mini switch, ore make the tone pot a pushpull to.

my suggestion was to adapt another switch .
this on wil put the tone on ore of.
so you can set the setting of the tone in forehand, but speedly can switch to crystal clear no tone involved, and back again.
i hope my bad englisch is thatway that you can understand what i would like to explain.

but again, i am getting more and more to the point that less is more, i think with all the posebillitys with this 1 pup setup is more than enough