@Orycteropus: Thanks for the info-yet: just one page (p.240-240?)
About the "elephant-hyrax-stairs" plan: wouldn't work, as hyraxes are good jumpers and climbers. Keeping various species together or close to each other according to taxonomy, like a "Afrotheria" House with elephants, aardvarks, hyraxes, manatees, tenrecs and elephant shrews etc. would be an interesting idea, yet most modern visitors wouldn't understand and appretiate it. In terms of both architecture and animal design, the Tierpark Berlin Friedrichsfelde Pachyderm House was thus already outdated when it was built in 1989.
Or if to speak in "fashion" terms, in regard to zoo presentation: habitat display (although most often correct in "details") is currently "in", systematical display is "out"-which isn't actually too bad.
However, certain umbrella terms (like "islands", "deserts" etc.) could be and are used to assemble species of different zoogeographical origin within one zoo theme. Or You're as smart as Leipzig and could call Your mixture "Gondwana Land"...
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Mixing meerkats with larger hoofstock has the disadvantage of meerkats escaping due to tunneling (as the common hoofstock exhibit design is not suitable to keep in smaller animals) and hoofstock stepping into meerkat holes and maybe thus hurting themselves.
Another mixed-species exhibit with porcupines (besides Budapest's Vultures & Porcupine combi) is the Nyala-Marabou-Porcupine-etc.-exhibit at Duisburg Zoo; however, I heard several complaints that the porcupines caused problems there, injuring other animals with their quills. All in all, not the easiest animals to combine with other species...
