your way is the only way to do it, alp. there are issues, though, depending on where you want to run, and what class. ECTA requires a 5-liter minimum capacity if you want to run production modified, and to get that requires a 6 x 9-inch tube, or a 28 x 4-inch tube, or an 18 x 4-inch tube (like here) with another 8 x 4-inch on the other side.Looks great Tony! Very compact for a dual engine,, but you're not going to copy my one side tank idea, right?
the 6-inch is too fat, the 28-inch is too long, the stock tank is too high. if you don't want to run production modified you can make the tank tiny.
i could never figure out why the one stan shenton illustrated had the tank on top: