The two renderings are the L52 and the L450. The L450 has the starboard helm.
I'd guess weight would still be around 15T for the 450
In response to demand on the part of some customers for large catamarans available in a more conventional version, Lagoon
is extending its range with a hard top version (without flybridge) of the Lagoon
450 and 52. The two models featuring a conventional helm station and lowered rig for the Sport Top version, available in the summer of 2015, will give a whole new meaning to the idea of comfort according to Lagoon