Hi Rivet,
I havent got much in the way of reference material with me currently, but it looks like a Mk2 1/2 tonner, from aprox 1956 - 1958ish. I think Brockhouse also made the mark 2, as well as Sankey, does it have the chassis plate still?
Personally I think its well worth restoring, hows your welding ability?
Seems a shame to put a later tub on, as these 1/2 tonners are fairly scarce these days, plus yours seems to be fairly complete