In this "package deal" i bought another truck, without a crane. I thought it would be nice to complete this truck as well. By drilling out the rivet the crane will come loose and i can mount this on the craneless car with a small bolt and nut. I found a donor car with the crane:
But: the donor is in a pretty good shape. On the down side: it is painted partly. The craneless car is original.
The donor car looks better from beneath, the "subframe" looks like new. The craneless one is rusted and bent:
My donor has orignal tyres, old ones. Not remountable without breaking.
I will start with the removal of the extra paint and see what happens. I found some info here to work with. My plan is to keep the original paint as is/