Well done so far, with a nice coloring scheme!
Please be critical of my work so I'll have a better idea on areas to hopefully improve.
You ask for improvements ..
Also added the water pipe from the front of the engine to the wing radiator
The way back: If I remember right, there are two holes on the cooler, one as you added, the cooled water goes then via a second pipe into the fuselage to the water pump on the back side of the engine. Fuel pipes from the tank (beside the cooler in the upper wing) are also possible.
You can also add turnbuckles.
I know the details from my Pfalz build this year, but it was a Profipack with PE, shown here too.
Cheers,
Frank