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It bolts on no mods to the batwing. Also will fit a viper with different machining.
I understand most of what you've mentioned and although when I put the D44 and your "construction" side by side I didn't see the direct marriage of the cover to yours but if it is it is, it's likely my visualization.
The C-beam mount though in your snapshot looks to certainly require that the C-beam be "altered" for use. The C-beam mounts on a D44 are parallel to the pinion & drive-line and the mount on yours (on the right side) seems to not be parallel to the pinion and drive-line. The left side certainly does but not the Corvette required side. Is that something that's been addressed easily? Your C-beam seems to only display one fastener and something else I can't make out in the image. Do you have a snapshot of a C-beam attached and a Corvette D44 cover bolted to the housing with maybe more detail?