A public house in fel would allow anyone to walk onto your plot. You could set door security settings, but stealthed players can easily follow you in when you open them. Poor house design can be problematic as well, even in a private home. For example, leaving out that back little corner piece in the NW can allow targeting of players inside. Fences, arches, and low walls (among others) can also allow you to be targeted. If you really want to go public I'm sure you could make it work, however. Using teleporters instead of doors would keep even stealthers out. Just be careful in your design and you can have a safe home in fel, although I usually find the requirements to be overly burdensome, for example using packies with teleporters can be a pain.
As far as a guide, don't know of one.