I saw mention of the Marixian one as well, but never heard of any official release beyond that Oct 3rd 1999 post. I expect the failure was probably due to the astronomical price of the kit, and rarity of the chassis it needed.
I ~do~ remember eBay having a Mobile shell about that size up a bit later, in 2000 sometime, so its possible Marixian gave up and sold off their master-shell. This seems likely, as the Marixian kit never materialised, and if they were counting on presales, it would explain the flop. Who would pre-buy without owning the rare chassis?
I remember a company in the US having images of the shell on their web-site, a bad-rep firm by the name of RC-Tank (no relation to any current company) They were pre-selling military tank kits, and then disappeared with a load of customer's cash. They resurfaced about a year later in California, and once again pursued, vanished, taking the shell into obscurity.
If anyone DOES get word of it... let me know? I just bagged a 'Tiger Joe' chassis, and had hopes of making a SHADO-Mobile of it.
WhiteWolf
(hoping they make Region 1 or 0 DVD's of the UFO series)