Astus has been building these very interesting sliding beam trimarans now for some time this video on Voiles et Voiliers shows the features of the Astus 24 model.
The rough bing translate from the page:
53rd Salon Nautique de Paris
Shipyard Astusboats arrives at the Paris boat show with a new cruise folding and transportable trimaran, Astus 24. Designed by Eric Henseval, this unit of 7.40 metres is the largest produced to date by the morbihanais shipyard. It remains true to the brand's values: simplicity, ease, and low cost. Thanks to its size and its design, the new Astus should allow classic cruising in monohull regulars to the multi without too much to scare... Here is the video of Pierre-Marie Bourguinat explanations.