Hi Bruce
Just joined the site and came across your Dragon Wagon. I'm building the same exact kit and blogging it on the Military Modelling Magazine site. Had to stop though as my house renovation has taken presidence.
I got a block with mine as well, during the prime mover part, so I left it for a week and started the trailer, that helped as I have completed the trailer. The prime mover still has to be finished. I had been using EP detail sets for the interior and exterior, and as it was my first kit for nearly 25 years and using the detail sets for the first time did not help.
I have since been gathering other bits for the load on the trailer and stuff for the dio it will sit in.
I think that to ''unblock'' a 'block' is to try something totally outside your comfort zone, like a car or boat, something you do not normally model.
Cheers Mike