Status report:
My new TT-bike is nearly done.
It's hard to see on this picture, but it doesn't have gear shifters yet, so for now it is a single speed TT-bike

I had my wife take this picture to help me dial in the aero position.
The spacers will have to go and the steering tube will be cut, as I see it now.
I did a first testride in it's one gear (39/13) and it felt fantastic already