Copplestone Powerarmor make great Weird War II Mechas
One of the main advantages of 15mm is the ability to mix stuff as you see fit. I searched through my 28mm lead pile and came up with these Power Armor guys from Copplestone Castings. Being bulky and crude they match Weird War II quite well, I think.
I'm going to use them with Gruntz and Fireteam Andromeda, so giving them proper stats won't be a problem.