After practically developing carpal tunnel from all of the clicking involved with manufacturing Battle Tank (Craft) for sale, I thought "There has to be a better way..."
So I started brainstorming about how to "automate" this process a bit more. I hit upon the idea that we could wrangle a Guild Rep into "running" the business for us, and just put it on auto pilot (make infinite, sell all). Of course this wouldn't be completely painless so I added a 10% "management fee" to the cost of production, but this would be well worth saving the seemingly infinite clicking.
What this mod does:Presents a new research topic called Defense Contract. This depends on Privatizing World Peace and the interrogation of a Broken Traders Guild Rep. Costs are minor for the topic, and once researched allows for the production of "Defense Contracting" in the "Merchandise" section.
$2,557,500, 100 workshop space, and 10000 hours will produce one "Filled Defense Contract" ( Sales Price - $4,000,000" ). (With my factory base of 410 Runts cranking away, this is showing an upfront profit of $42.5 million/month before salaries and overhead).
This is strictly designed to make the endgame burden a bit easier by minimizing a bit of the grindi-ness.
Edit: Updated for Piratez .99.e.3 ( to include Armory requirement and also adds in a slight cost for workers to simulate space in the vaults for the Plastasteel).