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Tesla made waves a few months ago when it revealed that it was already utilizing single-piece megacasts for the Model Y’s rear underbody. The innovation was evident with automotive veterans such as Sandy Munro praising Tesla for its bold strategy. During that time, Tesla announced that its...
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Teslarati said:
... In later replies, the die-casting veteran mentioned that the image was from Texas, USA. A longtime acquaintance in the industry sent the photo to him. ...]
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Model Y has always been a unibody design. The single piece rear casting is not what makes it unibody.
From Motor Trend:
"Unibody is short for unit body or unitized body—meaning the body, floorboards, and major chassis structural support and crash-protection elements are welded, bonded, molded, or somehow joined into a single structural element."
Effectively it's the same design, single piece rear casting just reduces the number of welds and bonds.
A look at the history of vehicle structural design considering body on frame, unibody, monocoque, space frame, skateboard chassis, and other techniques.
I think 2 pieces may be the optimal point - the better to allow for insertion of all the egg guts in between the two egg-shell-halves. The point of all this was to reduce the 100-odd welded/bolted/riveted individually made pieces down to just a few.