Newly acquired Sankey ex Comms BDR trailer

[Griff1963]

Afternoon everyone, just bought ex Comms trailer (now BDR/tools trailer) 27-FH-60.
She is reasonably complete but I need to source some parts / tools for the project.
As far as I can tell, she was based at Brize and Lynham before transferring to 42 signals.
I have fitted a jockey wheel for ease of movement and located the jerry can in its cage.
I've noticed that one of the hinge arms that hold the doors open is missing (as per photo) so need to acquire one if anyone has any ideas where I can get one.
Also, I obviously need to populate the shadow board so could do with any help at all with what they might be (also what should occupy the under trailer cabinets - welding kit ?).
Any help or advice gratefully accepted.

Cheers

Griff