RE: Polystrene tanks...U can make em.!
Hi Vauxhall,
You have my curiosity. I am familiar with the Roaring 20 by ken Willard; but what is a Mark 2?
Another possibility for a tank is to slice off a cylinder of Fugi film canister. You would have to do it smoothly to get the lid to seal. Just a thought.
Good luck,
Bob G