Maybe just an oversight, but be sure you don't ground the coil as shown, it must be connected to the points in your distributor. The alternator present may indicate you have 12 volt system, so you have to include a ballast resistor and the wiring to bypass it when starting.
Don't worry about people concerned by non-standard symbols. Even the acclaimed American Autowire instructions utilize mostly non-standard diagrams and sideways grounding symbols.
There are plenty of good reasons to design and build your own wiring system. I have wired several modified vehicles from scratch and never used a stock harness. Its the best way to make improvements that were never included in the original wiring, such as adequate fuses, control relays for headlights and brake lights, trailer brake controller wiring, headlight reminder, alarm and security systems, turn signals, stereo system, AC systems, and such that many of us appreciate. It is a lot better to develop those circuits on paper before you start than to patch into a stock circuit later. Just use good design practice and proper techniques in building the harness.
