@Iggy
Thanks for your kind words. Yes, the system it is entire, with the case and everything. It is ready to run, as soon as you connect your keyboard, your mouse and a monitor on it.
Not only supports both OS, but it is totally stable with them. The other two systems you mentioned I am not sure how mature is MorphOS on them. The Pegasos II is a very good machine, and rock solid, to run both OSes.