I posted a little while ago a series of odd mower concepts, including a sew mowers adapted with push bikes, i have since found this image:
Ignoring the Bycicle, this looks to me like somone has found a way to fit a Twin engine to a regular, pressed steel base, you can see the cowl overhangs the front a fair bit.
I know these mounts are substantually different (Both engine & Cowl) anyone ever seen anything like this (wonder if the base has holes we cant see cut in it to accomodate the extra size.