Old trick: Break down the donor bike and put the parts in a box. Much less conspicuous that way.

A word of caution: One of the design flaws of the c-record cranks is that if you throw your chain over the outer edge of the large ring, the chain can fall all the way down the length of the crank arm and wedge down by the crank bolt rather than land not he flat end of a traditionally shaped crank. This can wreck the beautiful finish on the c-record cranks. Be extra careful when trying to set up your new drivetrain. When switching to a narrower 9-/10-speed chain, adjust the outer limit of the front derailleur in little to account for the narrower chain and then adjust out as needed and don't power through the shifts until the front derailleur is dialed in.

Let's assume the Gitane mixte is ridden by the girlfriend. If your girlfriend will only let you have two bikes (Faggin & Pinarello), is she really marriage material? This time of courting sets an important precedent and foundation for your future!