Damo,
The yellow camper you are talking about without the middle section is indeed an Antex version. Like you say, it is all yellow with palm tree decals and also comes with a separate blue tent (like the orange safari tent).
There is a good photo of it in the 3rd edition of the Collector book in the Antex section. I got mine from a seller in Argentina a year or so ago MISB. Neither the cost for the camper, nor the shipping were ridiculously expensive.
Btw, nice deal on the Lufthansa bus.
Claire