I didn't do much modification to my GB other than the telescoping pants. I superglued carbonfiber to secure the metal pushrod extensions to the wooden pushrods. I didn't like the shrink tubing technique to fasten them together. I bought my tank at the local hobby store. Tower has them too. Mine is a 21oz Sullivan. If you want to be sure to get 15 minutes, you might go with a 30oz tank. My 21oz tank required carving up the tank mouting bracket a bit. Its a bit of a rinky-dink setup as is. I would completely cut off the wood mount for the smaller, stock tank, and do it like the picture below, if I were to re-do it (minus the removable firewall of course). The Saito 180's inner diameter of its carburetor fuel nipple is smaller than standard fuel plumbing's inner diameter. You can try bigger tubing, but it shouldn't be necessary.