Marc,
Neat solution, what in earth is that all You've built in? I don't recognize some parts at all.

I am going to use the side walls in the engine bay as well, in order to have all servicing accessible from there.
Good idea to paint the inside of the fuse, looks very pro.

Btw, I have defuelled the system after the testrun and a full fuel system holds around 5,5 litres, including the hopper.