IO, I think . . .
think . . . I know what you're saying.
The engine has a slight bit of layover built into the design. As a prototype, we're going to attempt to put the engine in straight up to allow us more room on the driver's side for exhaust.
The K exhausts from the left. In Great Britain, where most of the Midget/K-series swaps are performed, the steering is on the right hand side, which makes the swap pretty easy. If it will go in straight up, we'll have more room for exhaust routing with our left hand drive parameter.
The K was designed for FWD applications, which would likely have a bearing on bell housing mounting points with respect to casting parameters for engine mounting.
So if I'm reading what you're saying correctly, to answer the question, "is the part defined by the drawing or 'the guy doing the work'?", and seeing as I wasn't present when Mike performed the work, my most concise and accurate positive response would probably be "yes, I think so".
And to make it even goofier, this plate also bolts up to a Chevy bell in order to dyno, but before the engine goes in, the ears will likely have to be trimmed in order to clear the engine bay.