From what I've read, Camel Cataphracts are kind of semi-fictional. There is one mention of them in Roman sources, apparently Bactrians used them but without success - the camel's self-preservation is too high to perform a suicidal cavalry charge and its hooves are soft and easily damaged.
That being said, it's not an argument against making the unit, it's quite interesting in fact. I wanted to say no at first since because I can't make the armor - I just combine other people's work really. However, I think I've seen a seperated frontal armor model somewhere, I'll see if it can be fitted on a camel. If that works, the neck and head armor would be just painted on the skin, while spear attack can be transplanted from some horseman unit.
There two other "fusion" units I wanted to make - Mounted Javelinman & Mounted Crossbowman. Correct me if I'm wrong - at least I think those are missing - I thought I found the Mounted Javelinman in TAM but it turned out to be a horse archer / placeholder.