Though the illustration of the 'Workers' Friend' is rather like a Victorian version of the lifting rig from Aliens, the illustration on the cover shows a Prussian war-walker rather more in the style of a Killa Kan.
My plan is to use the GW models I have lying around - a Sentinal walker for a lightly-armoured version and a Dreadnought for the heavy version. This will require either some rules fudging (giving the British access to the Prussian walker, or allowing weapon swaps, or playing a flamethrower that 'counts as' a machine gun, or all three), but the rules have only been out for a couple of weeks...