@Perforated:
I guess the Unit Type is Warmachine.
You are right about the 27" charge xD... I would think that the risk that you gonna take for that is a huge one since the failure to get the right dice roll would mean the Steam Tank would take wounds and render it almost un-usable.
I'm quite pleased with the general acceptance of the Engineer upgrade. I still think that during the design of the Stank, the Master Engineer that was added to the Stank, artificially raised the cost of the Stank. It doesn't matter if he does nothing or not, that was how GW developers did things then. Because of improved design theory now, that we might see the Stank costed appropriately.