Was going to ask you if the crane would not interfere with the trailer. Had not seen that you have moved the hitch backwards.
Are you going to install the supports on the rear too? I see you have them sitting on the desk in the last picture you posted.
Looks like a nice and interesting project you have in store for yourself! ...
Hope you will find the time to post some progress pictures of your work in the "Euro Style Trucks and Trailers" section of the forum