It's a Giga Wiesel - technically it's SpeedsterDEN's own take on the basic idea of the Dream flight Weasel plank slope glider, Scaled up just over 420% (Yes, the name is a bit uninventive; No, he doesn't produce or sell them in
any way or form, but he did do a thread on how to build them on RCGroups).
Its 3.8m(12.5') span and 6.8kg (15lbs)AUW.
Its mainly just hotwired insulation foam in brown Kraft paper with a couple of carbon tubes in it and an inserted Etherfoam fuse in the middle:
I think there is some fiberglass on the LE though. This and the need for a hotwire rig ought to make the upscaled Kraken a simpler build (If you're in a place where you can easily get hold of DTF
)
SpeedsterDEN has a bunch of vids of both the Gigawiesel and its smaller siblings in different more or less "inventive" uses on Youtube
My personal favorite is the direct counterpart to the Giga, his Wiesel Light, at just 6oz and 900mm.