Your car looks awesome !
Are you sure the 90° elbow between your filler neck and the fuel tank is fuel resistant? It looks like a cooling (water) silicone elbow to me, but I might be mistaken as I can't see the internal layer. Fuel resistant silicone hoses/elbows have a fluoro-silicone layer inside (usually brick orange-red colour).
However, with the fumes in the fuel tank compartment, the outside layer of silicone will certainly not last forever, and I would rather go directly for a 100% Nitrile elbow like this one
, which are specifically designed for filling circuits.
But it is just my humble opinion
Anyway, congratulations for the car!