Got to agree with the suggestion that you look at Landships, though you'll find it's more geared to Braille Scale modelling. In 1/35th your choices for US Army tanks are either the FT-17 or the Mark V, so you've the choice between the difficult RPM Renault or Emhar's not-very-good Mark V.
The Emhar tank is reviewed
HERE , though the review doesn't really tackle the problems of proportion that mess up Emhar's British heavies.