Just a comment on the following:
> Good luck.  I've had no success running recent NetBSD diskless; I think
> NFS is sufficiently broken (or perhaps merely shows up brokenness
> elsewhere) that it's not usable.

I use NetBSD diskless every day on a 3/160 (I think) and it works very well.
Running on a 3/50 works almost as well, but one of my friends ran into
a bug which he said was caused by *swapping* over the network... I haven't
experienced this firsthand.

I think it'd be fairly stable. YMMV.
--
____  -Ben Cottrell (home page http://www.csua.berkeley.edu/~benco/)
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