In a piece of a cardboard I draw the basic scheme of the iron bars and glue some balsa beams.
Then I glue L shaped plastic stripes around the balsa beams with minimum cyanoacrylate glue
the iron contraction
and the crane winch and motor from scrap box(italeri's bergepanther, tamiya and some plastic stripes)
The whole project in a dry fit
I would like to thank my good friend and great modeller Ioanni Lekka for teaching me the construction of iron frames with balsa guides