RELENG_7 jails on current host

Hi,

I'm looking for some confirmation/caveats for using a -current host and 
RELENG_7 jails. Mostly I'm wondering whether -current is in good enough shape 
to host RELENG_7 jails. What I'm trying to accomplish is to have the machine 
that currently builds packages for -stable machines as well as hosting a 
number of services (low volume httpd/irc/imap/smtp), can be upgraded to 
current without significant modification to the jails. The only modification I 
expect to be making is fake uname output and set certain port related 
variables for the -stable build server.

The reason I'm wanting to do this is because I'm happily running current on my 
work laptop but building ports interferes too much. I figured building ports 
in a -current jail on a -stable host would not work very well, but I'll 
happily be corrected on that if that's no problem.

Jails have been built as per jail(8) manpage, not using ezjail. Nullfs mounts 
exist to share binaries and trees like /usr/ports.
-- 
Mel