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Peltier Cells generate incredibly small amounts of current for the amount of heat required. If you need to generate electricity via waste oil then a steam powered generator would be the way to go. Otherwise, solar would be much cheaper and a better long term solution.
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One major problem with this article: "The GY-6 carb has an electric choke as well, which is what the wire on it is attached to. This generally reduces the amount of air going into the motor some until it warms up, making it easier for the motor to start up when it's cold."The device you're talking about it the enrichment circuit. When you first turn on the scooter the circuit is open, allowing more fuel to flow into the the engine. As the device warms up a needle is extended and stops this extra fuel flow. It doesn't matter if the engine is running or not, as long as power is applied the flow will shut down.
Nicely done, I would suggest reinforcing the ways by using steel angle for the surface. The wood is subject to swelling/shrinking based on humidity and it will eventually wear down.It's not as critical as a metalworking lathe but it can still become an issue.
Solar Panel Setup around $100
How to Make the Card-Case