re: Capsules
The design we proposed for NASA's Alternate Access concept was easily adaptable to manned use. We were going to use surplus Titans (like the Gemini) to launch them, and there were enough of them for many launches. Later ones could have been launched on other boosters, or one of our own design.
It would have worked just fine. The program was scrapped. The first unmanned Alternate Access units were supposed to be fielded in 2003.