That is just the crank case, like in the picture I've already posted.
Yeah, that was sort of my point.
The cylinder banks are cast and machined as separate parts, unlike in a typical car engine.
Yes thank you, I am familiar with the Merlin engine. Also motorcycle and car engines. Have rebuilt quite a few of those which I found to be of an identical architectural approach to the Merlin. Even at 22:10.
Perhaps if you consistently used accepted terminology we could all get a handle on the differences in production you are claiming. Are you under the illusion that the barrels and heads are typically one piece? Are you talking about cylinder liners versus Nikasil / Alusil, for example?