Sorry for this late post but there is a fine example of a ferret
outdoor enclosure with diagrams of the construction and photographs
of ferrets in the enclosure. This is probably larger than most people
could afford or have room for but you may get some idea of what to do.

<http://trickytrixie.tripod.com/enclosures.htm>

Click on the various links to see all of the photographs.

Tony (not a vet), Sugar and Suki.
In memory of Sally and  Sue.

[Posted in FML 5718]