Here is how the WG return ended up looking.
No point in takeing pictuarez after installation as everything is hidden under the turbine.
Since the pipes are 38mm OD and the flexpipe has 40mm ID I had to space it out with a 1mm thick 40 mm OD pipe I found at Torshovbil.no. It was so tight I had to heat the parts up to get them to fit. I will be using a couple of T-bolt clamps to press the flex hose to the flanges with no cuts. Clamps will hopefully do fine as the flex hose is not stressed in any way.