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My point is that if you truly want to "stress mount" an engine directly to the tub, both the tub and engine have to be designed for it. Most stock block engines can't be stress mounted because they weren't designed to be a chassis element.
It works in F1 with multiple engines because the FIA stipulates in their technical regs that the engines have to be 90 degrees and share common mounting points on the tubs. There's nothing in the ACO's tech regs, as seen by the Audi diesels being 90 degrees (V12 and V10) and 120 degrees (V6), Judd having 72 and 90 degree V10s, the Nissan V6 being 60 degrees, everyone else's V8s being 90 degrees and the Toyota V6 and Porsche V4 being 90 degrees.
Only way for a customer chassis to accommodate various engines is have different mounting points for a stress mounted engine (difficult and cost/logistics prohibitive), or use tube frame or plate adaptors that bolt to the tub.
You also have to remember that most of the customer engines don't have the oil tank mounted on the front of them like the factory built engines do, at least when mounted in the factory cars. The factory teams have the advantage of designing their car around one particular engine and the chassis around that given engine.
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