You also need to consider the effects of different locations for the parts on the center of gravity of the vehicle. E-bikes may eliminate some parts (you'd think no radiator, water pump, hoses etc but then some more powerful electric motors use those parts) but a sufficient quantity of batteries may be both very heavy as well as bulky. You might be able to locate individual cells/batteries in different spots instead of all in one location, but you have to then consider if that makes it more difficult to service or swap out discharged/damaged cells.
A spread sheet is useful for determing the overall CofG by having a line for each component along with its weight and where the component CofG falls in the assembled vehicle. You sum all of that together to arrive at the combined CofG. Don't forget to include the CofG for the rider/passenger too.
You need a reasonably accurate scale, and everything needs to be weighed. You'll probably need several scales in different ranges. A freight scale suitable for weighing a 160 pound motor is probably going to lack resolution for getting accurate numbers on light parts. If the CoG of the part isn't obvious (say a rectangular battery vs an exhaust system) you'll need to determine the location of it. That can be done by hanging it from different points and drawing a line across the part directly below the hanging point. Where the lines intersect is the CofG. Here's an example where I hung a motor from different motor mount bolts with a plumb line from the attachment point on the hoist:
http://www.eurospares.com/graphics/y...f/yz250cog.jpg
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He put the foot pegs on bars running down parallel to the forks (wider) and thus kept out of the way of the front wheel turning.
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That will help on the footpeg bracketry, but you still need to ensure the rider's legs clear the tire. I'd have some concerns about the parallel footpeg mounts being more prone to flexing because of a longer unsupported run of tubing. You can work around that by increasing the tube diameter but that might end up bulkier or heavier than a triangulated structure. With a lot of this stuff you will probably start off with several different possible ways to build the component and then you have to mull it over and figure out which works best, keeping in mind that "best" for that component may mean "not so good" for the way it interacts with some other part. Try to not design a part in isolation, but rather keep in mind how everything may best work together.
It can drive you mad trying to keep track of everything.
cheers,
Michael