Finally got an email reply back from the 6XD Transaxle folks ( Let’s call it the 6XD-MTX) .
(asked about the length and ballpark cost estimate)
Regarding the 6XD-MTX Length:
“It was made for the GT40 market, fits the GT40 Superformance and other
GT40 market builds and the Original GT40!”
6XD-MTX Cost:
“ $31k for the first 25 client orders / then market pricing will be $36k”
So…another (pricey) option but much better than no options at all !