You do good work! I do mine only slightly different. I use a straw from soda drink and make a small mount for it at both ends. On the cowl I mount a fuel dot just above where the straws ends. On the carb end I leave the straws about 1/4" short so it does not actually touch the engine. My thinking was If I had to pull it all back apart the straws would still be in place. If someone uses the fuel dot like me. Be sure and tie some string to it and mount the other end of the sting to the female part of the dot inside the cowl. Without a line on it the dot could be lost in the air.

David