@ Allan
My friend has soon sent his answer, he says that your request seems complicated. To obtain original plans, you have to contact the Service Historique de la Défense (SHD), which has several localisations :
VINCENNES
BREST
CHATELLERAULT
LORIENT
ROCHEFORT
CHERBOURG
TOULON
And the plans are only available for consultation on site, just like those at the National Maritime Museum, and not at Chaillot, but only in the Dugny (Le Bourget) storage rooms. And their shop doesn't sell plans
For best result, it's preferable to choose a precise ship before contacting the SHD, and to be patient, because the person which perhaps answers is generaly... much tired, never really reactive...
There are no collections in France that can be directly consulted online like those at the NMM Greenwich
So, there are two solutions :
1 - On the A.N.C.R.E. web french site, you can find monographs, many of which are now available in English and have been translated by Anthony Klouda (GB) or Gilles Korent (CAN), modelers who are well-versed in shipbuilding. Among these, is the "Bonhomme Richard" by John Paul Jones, a privateer, naval officer, and also... a well known french 64 guns war ship, named... le Fleuron
2 - Otherwise, there are the captures of plans. If a period is defined, my friend can scan a list of them, from the relevant volume of Rif Winfield's British Warships in the Age of Sail. Then, simply check the Greenwich website to see if they have the plans, which is often the case, since upon the arrival in England of captured French ships, which were sent to Deptford and analyzed from every angle, before being brought up to RN standards
If you are interested in a precise model from the "Musée de la Marine", my friend can ask directly the responsable person of the Documentary Resources department in the Collections department, if she has the original plan and if she can send a print for him
That's all, folks
Friendly,
Chris