If you're starting out fresh, then I'd suggest you consider an idea that has something to do with the flightbox requirements. Consider chucking the heavy battery that's almost always accomodated. Blow off the battery and the power panel. Go with a self-contained starter and igniters. They're a lot safer and not nearly as heavy. They're also a lot more useful.

A flight box with long cords for the starter and igniters is actually a safety problem. Both cords come from the one location, and you need to route one cord around the back of the engine and the other cord around the front. And once the engine is started you have to get both cords out of the way of the spinning prop. Since they're both coming from one place, one of them at least is going to have to "go around" that spinning prop. It's way safer to have NO cords at all. Much safer. A bunch safer.

And it's also very convenient to have portable starting equipment. I'm all the time carrying mine up and down the pits getting balky engines started for other people. It saves a bunch of time to have that igniter handy. I know that mine is juiced up for sure. No guessing. If there is no heat in the plug, his plug is bad. If there is heat, and there hadn't been before, it's his battery or wire or powerpanel (the rheostat or fuse).

The convenience is really appreciated when an engine dies on taxi out. Or dies on the runway. When only a few guys are flying at our field we don't have much problem with making one try at restarting a plane on the runway. If they don't crank on the first try, we carry 'em off of course, but they usually do crank. Most times the plane has tripped up because of our lousy grass coverage and if the prop hasn't been chipped the engine will start instantly.

The batteries for the self-contained starters are much lighter than a flightbox battery. And no more expensive.