Dani Eder (retired Boeing space engineer) has produced a bunch of great content!
I've been a fan of Dani Eder's work ever since I found his wikibooks a couple years ago. Thought some of the folks here would find it enlightening, so here are a few links to get you started:
- Space Transport and Engineering Methods discusses all kinds of space related engineering topics ranging from space elevators to how to process asteroids into usable materials.
- Seed Factories focuses on the topic of factories that produce their own parts, bootstrapping from small starter kits like a tree growing from an acorn.
- To Mars and Beyond: on Becoming an Interplanetary Civilization explains how a bootstrapping approach in space can get us to Mars and everywhere else in the solar system much more inexpensively than trying to launch everything from earth.
Dani Eder is also known for inventing a type of megastructure known as an Eder Bubble, which is a vast inflatable structure that holds itself together by its own gravity.