While it's been quiet on the RPGObjects rpg front (Vig Press is still doing great work), we do have something new: Modern Dispatch (#139): Vampire Hunters20 by Paul King.
Mecha Omega provides a complete Mecha and Kaiju rule set, along with two campaign models, all in a lean 22 page package.
This product provides rules for constructing a mech from the ground up, as well as growing Kaiju for them to fight.
Mecha Omega is a generic OGL product, meaning it should work with any OGL game where characters have a Defense statistic that rises with character level, which obviously includes Modern20.