I presume that the "power of two" idea would allow block sizes of 256, 512, 
1024, 2048,... etc.   It would be nice to support other sector sizes though, 
since other systems (as in, I believe, the old Apollo/Domain systems) use a 
1.5K (1536) byte sector size.  Just a thought for consideration...  
Supporting a mountable Domain filesystem might be more hassle than its worth, 
but the kernel should at least support accessing it via an external program 
running against the raw disk device.

Pete