I have just started the wiring and its obvious to me that the original electrical schematic for my series 6 kit doesn't reflect all the newest thinking in a few areas and it doesn't reflect all of the panel switches I plan to have. My panel will be the standard steam gauges and an iPad mini and several toggle switches, along with a fuse box, so it should be a fairly basic wiring job (I hope). As I read the forum to glean info on the electrical system wiring there are so many customized versions its sometime confusing which items on each circuit are critical and which are not, and which are just plain clever. However, I do have a few basic questions to start me off:

1) I understand the need for a back EMF diode on the starter relay to protect the start switch contacts (my start switch is a red push button) but do I also need a diode on the master relay? I see there are some on the forum who have a diode on both relays but it seems that the master relay shouldn't see the same current levels as the starter relay, or am I missing something?
2) I notice that some on the forum have a two pole switch for controlling nav lights and strobes with one switch, with each pole on its own different size fuse (seems like a clever idea). I have an older non-LED Whelen nav light and strobe assemblies with a power supply. I'm assuming that the one two pole switch vs a separate single pole switch for each is to save panel space and eliminate one toggle switch. I'm I assuming correctly or is there some advantage to going with separate single pole switches?
3) I currently expect to have my instruments that require DC power (turn coordinator, tach this built in hour meter and radio) all on one single pole toggle switch but may consider separate switches and/or multiple pole switch(es) to allow for different fuse sizes, or to take advantage of any other considerations that make sense. Any consensus out there on what my best options are for this one? Although I'm interested in what people have done for this one, I'm actually more interested in why they did it the way they did. So please provide a little justification if you can. Opinions are acceptable if justification is thin.

Don't feel you need to respond to all 3 questions. I'll take input separately. Thanks in advance for any input