It is intended to be mildly radical but buildable. I would like to build it myself, but am unlikely to start actual coding this millennium. This is a system for running scheme. I don't actually think this will happen, but I'm stating priorities. Similarly, the following discussion below all relates to scheme code unless explicitly stated otherwise.
All code runs in the same address space.
And all code runs in kernel mode, for much the same reasons. The system is a permanently running scheme evaluator. There is no file system, but there is paging, which is somewhat extended to give persistence of data across power cycles. How to build it linux Use the linux kernel. Most non-kernel memory is given to scheme.