Just a quick update. I got the dev-kit in the mail yesterday, I booted it up with the touch screen attached that it came with. Was all working fine so today I started working on making a first break out which I will mill tomorrow to do a first test fit with the SOM connector. As there 3x70 pin connectors the positioning of them in relation to each other is very important.
Technically it should fit perfectly as I worked according to Technexion specs but lets see how it goes after they are soldered to a board.