Well Derek, I'm a visual guy too, but in this instance, I'm not sure how a picture is helpful. If you are correcting the wiring, not just rewiring it stock, then you are going to add a lot of things that weren't originally there. If you are just doing a stock rewire, stop now. The glow plugs need to be direct wired to a relay, then direct to the battery. Take all the load off the ignition switch. The starter needs upgraded, and a relay put in line between the starter solenoid and the ignition switch. Personally I would also put the fuel pump on a relay too. It doesn't pull much, but just as well get the load off the switch.
As far as ground locations, be smart. Battery should ground to the engine directly, with a large ground strap from the frame to engine. Where isn't really important as long as it isn't going to interfere with anything, or rub. Best if it is on the engine block itself. Head is ok too, just don't use a head bolt. The engine moves around a lot, so keep that in mind. As far as the harness itself goes, just use your head. Route it out of the way of moving parts, and don't intertwine wires with components. You should be able to remove the harness mostly without disassembling the machine. (Mostly.... I'm sure some things will need to be removed to get it out.) I've built a lot of harnesses. It is time consuming. Do it right. Use shrink wrap, and personally I would solder most everything, but I'm picky like that. I know how much longer a soldered terminal lasts over ones that aren't. Make sure the harness isn't too tight. Leave an inch or two excess to replace terminals should they fail, and room for the harness to flex if needed. Don't kink wires.
Good luck.
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