I have been building Titans for a game that Games Workshop released a while back. I’m not sure of the scale, but the smallest model is the same machine as the largest,which is pictured with their regular game scale figures. The game is a lot of fun, but putting the models together even more so. I will try and post some pictures when I start painting them. 
Those are cool! I used to play mech warrior way back and they remind me of some of those machines. I bet painting will be a lot of fun
These are Not my models. They belong to a friend of mine. Playing a game at our local gaming store. They have released a lot more models since this picture was taken. 
Oh wow those are cool!
Maybe you could get some painting tips from your friend- those look pretty darn awesome.