Colin Morris did definitely make a batch – probably 6 or 7 years ago and is worth contacting as he went through a whole heap of learning to get that small batch done.
“Tooling” is rather a grand word for the former that exists. It is sufficient to act as a starting point is not sufficient to simple allow top / bottom blanks to be stamped out. Again Colin is probably a good starting point to track down its whereabouts.
One last thing …. be aware that lengths of the tanks vary quite considerably between model variants.