Back in the '80s and '90s, Japanese model maker / artist Kow Yokoyama teamed with Hobby Japan to make "S.F.3.D". The basic premise was two competing groups trying to re-settle a post-apocalyptic Earth (one group was rather like the Hermann Goering Division visits the 23rd Century). Some very interesting powered armor -- not much bigger than the actual "pilots", yet presumably waldo controlled -- and VERY small AFVs and aircraft.
Best links are here and here .
A typical foot soldier in armor:
Best links are here and here .
A typical foot soldier in armor: