I just upgraded my EPIA M1000 to R5E50 to connect to my R5E50 master backend. I followed the wiki guide again and everything seems to be working great.
The only thing I found vague in the wiki was how to setup the frontend for nfs access to the backend. There were several different posts on the board here that gave me a few ways to connect the two. Before I add a note to the wiki I thought I'd post my method to see if there might be a better way. 
After configuring nfs on the backend I edited the File System table on the frontend to point to the backend /myth folder.
as root:
Code:
nano /etc/fstab
add this line:
<IP address of backend>:/myth /myth nfs defaults,auto,noatime 0 0
add this line:
<IP address of backend>:/myth /myth nfs defaults,auto,noatime 0 0