I'm in the final stages, stain/finish, of building a TOTW kit based on the french type c. w/iron furniture comments as follows
A. quality of parts is good though some castings have lot of flashing to remove, some are quite large. mot parts will require a lot of finishing and polishing.
B. their precarved stock was really frustrating. the barrel and RR channels fit almost prefectly, even the "wedding bands" on the Colraine barrel were very nicely inletted. However this actually presented a problem.
the lock was about 80% pre-inlet and the relative lock and barrel positions were fixed. I wanted to shift the relationship of the barrel back or the lock forward a smidge to more properly position them for a Chambers touchhole liner. they were perfectly placed if one planned on using a straight drilled touchhole. resolving this required some finageling, involving re configuring the pan cavity a bit----and a LOT of thinking and planning.
C. the pre inlets for the buttplate (the ornate sorta-acanthus leaf type) was a serious pain- I would up bending the final up out of the way, inletting the rest of the plate and than tapping it back down and inletting as I did so. Their inletting for it was a bit off and a bit generous. I suspect it'd be fine for other simpler buttplates.
D. I ran into a the same problem with the routed-out inletting for the complex and ornate sideplate and the trigger guard finals as well. over generous in spots too, tight in others.
E. the wood is very plain which is OK for my use since it will be stained dark, however it seemed awfully soft in spots where I had to do fine carving--buttplate trigger guard and side plate.
F. as mentioned there are no instructions, per se; just a large scale drawing that gives some basic profiles and positions. In fact they seem to use one basic "plan" for several different french arms and they do not match up in some small details. Either experience or a GOOD basic flintlock building book will be needed by most.
Overall it is a good solid sound assembly of components good quality for the money I think, but --at least for more complex arms with more ornate detail--they can present problems for those with inexperience or those who are not willing to spend a lot of time and effort. For instance I imagine that their more basic "Tulle hunting gun" would be much more straight forward, and a better "first-build" selection.
there are other excellent options that are a more comfortable experience. My cousin who never built a flint long arm before bought a Chambers fowler kit and enrolled at the Connor Prairie summer gun building program to assemble it. He had a delightful experience and the resulting product is all one could ask for.