Alex, I didn't see much either. Maybe you saw/considered the below?
After a quick look at the Hardi-pipe, I saw that there was just under a 2" ID/OD difference between two sizes of pipe. If one would take 3/4" pieces of strapping attaching them vertically and then staple 1/4" plastic mesh screening over strapping on the OD of the interior pipe and then add more strapping/spacers over that, you could then slip the larger pipe over it making 1 inch chamber and a 3/4 inch chamber. Of course weight is of concern with using hardie concrete.
Hope someone is able to help you!
http://www.jameshardiefrcpipes.com.au/products/above_ground_stormwater_drainage/pipe_sizesHabits. Unlike the closely related P. townsendii, Rafinesque’s big-eared bat occurs in forested regions largely devoid of natural caves. Its natural roosting places are in hollow trees, crevices behind bark, and under dry leaves. It has been observed most frequently in buildings, both occupied and abandoned. Texas specimens have been captured in barns and abandoned wells. P. rafinesquii appears to be a solitary bat although colonies of 2-100 may be encountered in summer. Winter aggregations, usually of both sexes, are more numerous but even then solitary individuals are frequently found. The bats probably do not hibernate in East Texas, but in the northern part of their range they tend to seek out underground retreats and hibernate through the winter.
