They're not Tinboyz, but I have 2 (I think 2; at least one) models that can be used as Tinboyz with a bit of work if you want.
They're made by a now-defunct miniatures company called 'Demonblade'. They're a pretty obvious parody of Beakies, though if you really want to convey tinboy with them all you have to do is give them a robotic face, instead of their regular one. They've got enginey-bits on the back. They're fairly rare, from what I understand. They came with bionic arms, but I've used them all up on Nobz and the likes, so you'd have to scrounge something up for them or make bionic ones. I've been holding onto them for use as Tinboyz, but I haven't found an excuse to do anything with them yet, so if you're interested, I'm happy to work something out.
I may have two in my bitz bins, if I dig a little.