Many thanks to ExPo member "Mickldo" for bringing us information about this Toyota camper with pop-up roof.
The camper is owned by a fellow who posts using the name "Sönke" on the IH8MUD forum and elsewhere. Here's a link to the thread on 'MUD.
The camper cabin was designed by Sönke. The truck chassis, cab and cabin exterior were built by Marcus Haase, owner of the German firm Off-Road-Schmiede. Sönke finished the interior of the cabin.
Here's a link to the builder's web page for this project
The photos above and in following posts are from Sönke and from the offroad-schmiede.com web pages.