What it should be

• A multi-process and multi-threaded protected mode OS for 386+ CPUs.
• Written entirely in assembly. Why?
• Should use segment protection and paging to provide a stable and secure system. Why?
• Fully promable, so it can be ported to embedded environments that don't have a keyboard and / or screen. How?

What it shouldn't be

• Another of those bloated, portable, C based OSes ;-)