Just a short session in the shed tonight so I just did a small amount of work on the crane.
I did manage to fit 4 14ba nuts and washers on the top mounting bracket much to my amazement.

I think they are tight difficult to tell using thin nosed pliers (wish I had a 2mm spanner)
I soldered the bottom peice of the crane to the tube that attaches it to the tank the part is a peice of brass I turned down on a friend's myford lathe and filed some flat edges before drilling a hole through it

I cut a peice of brass sheet the same size as the back of winch and soldered it to the tube section then glued the winch with the remnants of the comical plastic cable removed and the handle section removed and filled where necessary and glued to the other side of the brass sheet.

With it fitted back on the tank it will need to have the handle made shorter to miss the superstructure if its rotated.

That is as far as I got before I realised how late it was I have some small wire cable I got from my friend with the lathe that is from an old rc plane part and is the perfect size for the crane so I will be fitting it to it hopefully next week.
I will also do some more work on the upper hatches as its nearly time to cut the top and see what can be done with them.