Re: modify the peanut
The problem with that tunnel in the tank is fuel will get trapped on one side and never make it to the other side with the petcock. So it will run out of gas with half a tank left.
You need to add a crossover tube on the bottom of the tank. Nothing big or fancy - just a small hose fitting on each side connected by a piece of tubing under the frame tube that will allow fuel to equalize between the left and right tank halves.