This is a funny conversion of the Stampe SV4: in the Indiana Jones movies, there is a sequence with a "german biplane" that is, in fact, an SV4-C slightly modified to be hanged to a Zeppelin.
RetrokiT realised a resin conversion set for Indi's plane (including a decal sheet). There is no need for big surgery in fact; just to replace some parts of the SV4 kit by the one in resin.
I've begun setting the "cockpits element" in place... Last photo shows you the resin elements.