Hi Kevin,
We have the Calibed Roof from Calicap.de for a year now. Wish we'd bought it earlier. Can only recommend this cold foam mattress. With the original one from VW I always woke up with pain in the hips. Not now anymore. Though Ms. marchugo (65 kilogram) claims to feel no difference. The price is right (I see they give a discount of 13 percent at the moment).
The mattress is just under 6 cm thick and that is absolutely the max fitting under the roof. It may be that the roof at the backside of the van comes up a few mm, as in my case. I just pushed the rubber seal slightly downwards to prevent water ingress. After a few days the mattress will settle and it fits.
As mentioned in another thread the Bella Donna cotton/elastene sheets 100 x 200 cm form a pleasant combination with this mattress. We also have two mini Wellpure memory foam pillows from Jysk (42 cm), that are small to stow but firm enough for a good sleep.
Regards from Amsterdam,
Marc.
Tip: (for all types of mattresses) Before closing the roof, pull the mattress just half a centimetre to the front of the Cali, to prevent the seperate foot part clutching under the back of the roof. The mattress and its foot part tend to move to the rear of the van during the night, independent of nightly behaviour.