Hi Nutz, if they were housed in a shed, would they still be attacked? I'm just thinking if the roof may keep them out of sight.
If you need any ideas of a shed conversion Chris must be giving some inspiration at the moment as well as others on the forum :http://super-chipmunks.co.uk/forum/index.php/topic,177.0.html
It could be worth putting a stronger gauge mesh (19G) and above on the outer layer of the enclosure just incase they attack with some force. What about a scarecrow type of device, or are they too clever for that to keep them away? I was thinking about the streamer kind maybe stuck on the roof

I hope you can work something out....Gilly