Aussie Chev 'Indian Pattern' Ambulance

[cliff]

Hi Guys. I am doing a model of one of these Pictured below.

I am wondering if anyone can tell me whether the rear body was in fact canvas clad over composit board or wheather the board was just painted with a canvas cab roof lining and awning at the rear?

I do have some photos of these but not many that are full side on.

Can anyone help please?

(Pic AWM data base)