We recently swapped our Caravelle Exec 2011 from new for a Cali Beach new 2016 . ( nearly 2 years now but time flies)
The Caravelle was the best ever apart from the additional roof sleeping. The standard blinds were fine for us.
If only 2 sleeping in the Caravelle simply fold the rear bench down and use the 2 front seats folded down and use them, if really fussy use a lilo type for more comfort.
The Multiflex Board is a pain in the arse in the Beach. The Vw mattress that is an extra, is massive and a pain to move around
whilst camping if you go out on manoeuvres. If you don't want sand/grass all over it you have to put it on top of the front seats,
along with all the other stuff whilst putting the seat back upright, not a problem whilst dry, when raining !!
There is a Multiflex board for sale on the Cali forum, posted today I think no mattress though
Accessories For Sale - VW T5/T6 Multiflex board for Caravelle/California Beach