...This power panel may make your wiring installation easier and faster, but at significant cost. Breakers and switches are not necessarily expensive. And installation of discrete switches allows you to group them by function - a good idea if you're the type of pilot who likes to develop proficiency in being able to do things by "feel" so you can operate the airplane even if the lights go out...
Here is where I disagree with the thought of grouping switches by function.
My preference and recommendation is to group switches by phase of flight.
If you do this, then you want to set your switches where you need/want them, which is not by function.
What I'm saying is to group the switches you need for landing together (fuel pump, landing, and taxi light.). Switches needed for starting should be together, master, starter, and mags. You get the idea. I don't see any need to have the interior light switch and dimmer mixed in with the landing, taxi, position, and strobe lights.
It seems a bit illogical until you lay out your panel in full scale and figure out how and where your hand moves in each phase of flight.
Put the things you don't need for flight out of the way. My cabin heat is way over on the right side of the sub-panel, along with the interior light switch.
PS. Panel layout is a very personal thing, design the panel you want. Don't do something some guy (that would be me) on the net tells you to do because it sounds right. Remember, this is your interface to your plane, build it the way you want it.