Really, chaps, make them! it's piss easy. Come on, why should everything be available off the shelf for you? A sheet of 60 thou. Plastikard, a piercing saw (which, as model
makers you should have anyway) and a few evenings or a weekend of free time. Get the frame how you like it and then scribe round the inside onto a piece of thin Perspex and cut that with the same piercing saw, cleaning up with Swiss files. The cheap Lidl's diamond dust ones are very good for plastics as they don't tend to leave cut marks.
Colin, are you sure there's a crash tender
restored? As there were only 2 built
I find that very unlikely.