@pipascus - Problem is ... NO ONE really makes an excellent one!
-The stock should be walnut, or fruit wood (in some cases) but definitely not maple (unless going for a re-stocked here arm)
-The barrel should be no less than 44.3" long (actual barrel measured in pieds and pouces)
-The breech sction of the barrel, where octagonal, should be tapered (most are not)
-Only 1 wedding band on the barrel, round section continually tapering (again, most don't)
-There should be facets from the oct section on the barrel to the wedding band transition, about 2-1/4" long
-Typical all iron hardware for a trade FdC
-Lock with faceted pan, of slight banana shape and flat lockplate of a certain length I forget off the top of my head. IIRC the Davis lock is often touted as being the closest, but making mine to be LH'd, I started out with a LH Trade Lock by Danny Caywood and filed the lockplate flat.
-Lock surround rear finnial shold be more of an elongated tear drop than pure heart shape, as someone above mentioned, as in the dozen+ arms depicted in Bouchar'd book, all are the teardrop style
-Side plate of a long, flat 'S' shape with circular fieze in the center (which early 1700s Tulle FdC's did not have)
-Stock shape wth quite a bit of drop to full and severe curve
"I will SMACK you in the nose but good" in the pied de vache (Cow's foot) style
-Only 1 pin per ramrod pipe, whereas Track of the Wolf sold their alleged FdC plans for years showing 2 pins per pipe,
sacre bleu! It has since been corrected
(Hey, may be my letter to them actually did some good?)
I'm probably missing something, but you get the picture. And then again, it depends heaviliy on
which specific year Contract arm are you making? If indeed to be a FdC from the Tulle armory, and not just 'any' trade gun of the hunt from the lesser - yes, lesser quality - armories.
Advise you go on Facebook and look up Alex Efremenko, plus any posts he has also put here, as he is argueably THE BEST living maker of French arms. He is very open and I had consulted within many times in my build. When it came removing wood, he said something like:
"Remove wood to make it be trim and look svelte. Do it again - all over, everywhere, as there should be no more wood than absolutely necessary to hold it all together. Be careful, that upper forend will be FRAGILE when out of the stock. Do it again, all over. And ... once you reached the point to where you firmly believed you have RUINED it ... you're done!"