Why GNU Mach is so different?

[Ciro Cavani]

Hi, (and sorry my awful english...)

I want to work with GNU Mach to impove it, but I still very new like 
developer to can help. Even so I start trying to read the source code... 
but I was not successful in understand the "principles" and other basic 
stuffs...
Now, I am reading (and studing) all docs that I could find about CMU 
Mach UX e US, OSF e Utah Mach . I read old massages from lists too and I 
strange that many important stuffs in research and others implementation 
(like NORMA IPC, SMP, RT, ports...) are missing in the official 
distibution (CVS). Why? Will be need to develop this stuffs again?
I want to work with distributed systems and clusters until the finish of 
my course (college). I know that many work are being done with L4, but 
in my understanding, when someone say that L4 is "working in process", I 
see in Mach work done with many tests, researches and results waiting to 
be improved and used.
Others thoughts that I had, are about the Corba (I read something and 
nothing more), modules for devices drives (like linux); those things are 
better implemented on kernel or is possible on user space?

I know that some ideas can be wrong... after some mounths trying 
contribute to GNU/Hurd, I concluded that more study about OS is 
necessary before I try something.... but I keep trying...

valeu
cavani