I intend to use the original housing from a second ECU I bought on ebay.

Hello I bought the vw version of this connector header here: https://www.mouser.at/ProductDetail/571-284617-1 and the connector housing here: https://de.aliexpress.com/item/4001245927780.html?spm=a2g0o.order_list.order_list_main.90.d5fb5c5f0TtEsC&gatewayAdapt=glo2deu I so made a kicad footprint ...

Hi SciroccoEV

That's a Samtec Tiger Eye 1.27 pitch Connector.
Part Number for a 10 inch 30 pin Cable:
SFSD-15-28-H-10.00-DR-NDX

someone posted a dxf here
viewtopic.php?f=14&t=1269

Hy Gigas

Nice looking adapter plate,

I just realist that I mad a minor mistake on the Drawing of the bolt plattern i posted in this forum.
One hole diameter was not corect.

Oil pump flange on the transmission,

Today i measured the bellhousing bolt pattern.
For those who want to add a third mtor or want attach a ICE as Range Extender or want to use the transmission as e-CVT.
Accuracy should be within 0,02 mm.