Great to see that this is going to a good home - well in Kev for stimulating the interest and Nathan for taking it on.
We loved our Italia 90 and have lots of photos of it if you need a reference point when doing the detail and decals. I replaced the doors on ours so did find a reasonable match for the red and green stripes, will try to dig these out if it helps (you might not need them just yet I guess!). If there are more common bits you need as you go, I and others on here will be able to help.
As others have said, one of the best special editions, a great zippy engine, and a great history project!
All the best
David