My thinking was Metrocab without model name but with the series number as MK or, alternatively, we can have Series I, Series II or Series III as model names. We'd be forcing the Series I a bit but they did refer to the later ones (which should make up the majority of the "Hooper" listings) as Series II etc in brochures and sometimes the badges (like: http://imcdb.org/vehicle_541496-Hooper-Metrocab-1999.html ). The TTT (one wonders why it wasn't just Series IV) actually came out before Kamkorp took over so that's one more inconsistency with the status quo.

Late last night when looking at them again I think I stumbled on a few minor changes between MCW and Reliant (and later) ones. I'll need to do a bit more checking but should be able to clean them a bit.