No OBS ...YET....sorry boys. It is coming by years end.
It is not tapered merely for the looks...fit and finish. Also to ensure the welds are perfect. Very little volumn is lost.
The second nipple on top is for the "puke tube"..merely run a hose off it straight down.
The bottle also has a spy glass built in so you can see your level.
On the second pic I posted it's in the cut out portion of the black piece.
PJ is digging around for a pic of the bottle mounted up and I will PM Tony (isootmypants) to see if he has a pic as well.
How much would one be bare aluminum? welds showing, not polished or anodized, like pretty much off the welding bench. looking for something different on my rat rod