My honest opinion mate is that this needs a lot of changes as is - there's way too much going on IMO on the exterior where it looks disjointed and some of the interior detail needs more consideration.
Take it with a pinch of salt but this is what i would do:
Exterior:
The livery looks way off - giallo like you said would look better.
Axe the 63 on the front hood.
Brake Calipers to match the livery
Consider changing the A Pillar to body color.
Rear deck lid and upper intakes need to be body color IMO - not enough blue on the exterior with all the dark carbon accents.
Move SVJ logo back to the fender
Rims: Need to be bright gold, not bronze. Center locks match livery.
Wing should have pinstripes along the outer edges on the side view.
Interior:
All alcantara seats, not a mix of leather.
I'd invert the seats as they are now - blue on outer AND inner bolsters, black insert with giallo stripe and stitching.
Behind seats - All blue with 63 and hexagon shape things in giallo to match seat insert color.
Transmission tunnel - all blue with the giallo stitching
Center console - black
Lower dash - leave blue.
Upper dash - black to reduce glare, i get it. Would be cool to see it all blue though!
Door pulls - giallo
All the best - you can't really go too wrong - the thing is epic.
And so it begins...1/100 specials.