My suggestion - rather than base it on Van's kit (which assumes a basic VFR steam gauge plane), put together a planning document with a list of all *your* electrical devices, each device's electrical load, and the appropriate wire gauge.
Then make a drawing that shows where each device is located. You can then ballpark the length for each device. From that you can total up your wire needs (add about 40% cuz it always just works out that way). Don't forget ground wires and the large-gauge wires too.
This is part of the planning process for a Vertical Power electrical system and should be too if you're wiring the old-fashion way. You can use something as simple as Excel and Power Point to do your planning.
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.
VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
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Wiring harness - length, gauge.
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