I'm no expert, but for me, the solution was dictated by lack of space. On the Autosparks site you'll find these
relay and fuse modules that can hold a variety of components. A single module can support 20 micro AT fuses! There's a mini relay module that holds 7 relays. So you can pack a lot of functionality into a very compact space using these. They also fit the standard size relays. They have 70A high power relays for switching main circuits. I put in two of these so that when you turn the key to "on" it kicks in these main relays. One for glow plugs, one for everything else. It helps to have the proper crimper tools too as I have pretty much everything coming off a relay and getting fused.
I recommend the fuses that light up when they blow. Helps to see the problem right away.
Nothing against the Blue Sea stuff it just wasn't right for me.