Great bike you got there
I have one myself so I know
What colors is it gonna be?
Paint can still be ordered at the original Gilera supplier, Lechler.
Please check the download section for a color index at their websitehttp://www.lechler.eu/on-line/Home/AreaDownload/Refinish/cardCatDocumenti.10019126.96.36.199.1.html
And there's a UK based firm http://www.paints4u.com
that will sell you spray cans in the original colors as well.
By the way, we love pictures on the forum here!
So I hope you are willing to post some pics
Greetings from overseas,