Blohm und Voss Bv-138. 1/72nd scale.
The model in the photo is not a 1/72nd scale styrene kit. It is, instead, a 1/72nd scale fiberglass kit that was created and produced by Jene Procknow. He built one and provided extra parts to me so I could build the one you see here.
Jene first created masters out of wood, then produced hollow parts by laying fiberglass cloth over the masters and coating the cloth with multiple layers of polyester resin. When cured, parts were removed and trimmed to their final shape. Smaller parts were cast solid from resin in RTV molds. Once all the parts were assembled in a similar manner as a standard styrene kit. Obviously, this is a highly simplified description of the process, but it gives you a general idea of how it was done.
As it turned out, Supermodel (who eventually became part of Italeri) released a 1/72nd injected styrene kit of the Bv-138 (actually two of them) only a few months after Jene completed his. I built them as well and, when placed next to Jene's fiberglass version, you were hard pressed to tell which was which.

