It pretty high tech so ill try explain as simple as possible (JOKE).     I squeezed some liquid nail into the crack and onto the base.  Lifted the bottom panel into place then used a nail gun to hold that then with my knee i lifted the side panel which had fallen to the right position then nail gunned that. I cleaned of the excess liquid nails with paint thinners on a rag once it had all dried i touched up the nail holes and the strip of glue with enamel model paint and a small brush.  Simple but it worked.

Cool mate  and thanks for the fast and funny reply . 
 My 2 problems are a) I'm low tech .. don't own a nail gun and b) mine is a different problem .
I have a split in the side (approx two thirds of the length of the side and roughly in the middle) . I am thinking of glueing (and temporarily clamping) a piece of ply on the inside and maybe nail it to the side of the cab as well with some short nails (so they don't protrude through the outside of the cab)

Hope you get the Electronics side sorted soon without too much more hassle 

Cheers
Dave