Why not have a tech project where u train an existing tech teams skill lvl or adding new training, as new types comes awailable during ages. And also be able to build a tech team from scratch in build que to customize a personal team. It will have low skill value acording to quality if school lvl. My reason to sudgest this is the progress from early 1900 untill sceduled game end (1960?) is hard to make realistic. As a human player you should have more controll.