I'M BACK!
sort of...
It's update-time:
Since I never made a picture of the truck with body and wheels, here is one:

The body looks like that because I can't paint and because I drove it for about 5mins without tapeing it, so a lot of paint got blasted off by stones.
Without the body:
Now there is more space between the motor and the rear diff drive cup:

Also in this picture: my ingenious cable routing...
There's one of the 3 modifications that were necessary to get the castle motor and a mod1 46T spur in there. Mike was right (of course), countersunk holes wouldn't look right in that spot. But then it's form follows funktion and not the other way round:

Other modifications were: 3/10th mm deep pocket in the mountingplate to clear the 46T spur. And 3/10th mm removed by milling where the mountingplate touches the x-braces, so the diff sits higher and the spur clears the x-braces.
New servo, Hitec 5955TG held in place with full force servo clamps:
And that's about it...
Hope you guys like it, looking forward to your comments and suggestions on what could be done better