I can't see any problem using mild steel just remember to keep the tank full when not in use and i'm sure they will out last all of us. incidentally the tanks on my Cromwell are made from a solder dipped plate but they still rusted out at the level of the water/fuel line, if they had been full there wouldn't have been an issue.
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1941 mk1 mortar Carrier
1941 Mk1* Carrier
1942 Mk1* Carrier
1943 T16 Carrier
1945 Mk3 Dingo
1941 Mk3 Covenanter
1941 Mk4 Churchill AVRE (now sold)
1944 Mk6 Cromwell (now sold)
1952 Mk3 Centurion
1952 ARV Centurion
1952 ARV Centurion
1953 Mk3 Centurion (breaking)
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