Alan and I are going to give the Gruntz rules a try out using our 28mm collections. I was putting together a 300 point list when I realised that what I was creating was just a 40k Imperial Guard list. So I dug out an old IronMan toy and stuck him to a base. I will come back to it, but at the moment it's just a big mecha - I will replace the right arm with a cannon.
Sentinels from GW (the pink one has been paint stripped - somehow the red paint has stained the plastic underneath; figures from Wargames Factory.