I've only seen one of the OAVs, but I'm familar with the general type. You may want to check out Mazinkaiser for a similar recent update of Go Nagais original work. Mazinkaiser also has of the best opening themes in anime. "Only the finest violence... "
"The power of bakers, the power of artists; even the power of witches! It must be a power given by God... sometimes we suffer for it."- Ursula, Kikis Delivery Service.