Charlie,
Well, the difference is that the man asked a question and seems to have received good information in the answers. He can now make decisions regarding future choices with these or other guns. He can avoid being embarassed by having errors pointed out at juried events. I have made some similar mistakes and understand.
Some people are primarily shooters and I was in this category. I put together a few guns which were intended to please me or accomplish specific uses. I then moved on towards some re-enacting and my new interest drove me to change some details.
If the goal is to have a fine rifle for hunting, shooting or hanging over the mantle, then build what ever is desired and enjoy it to your heart's content, but do not attempt to pass the gun(s) off as correct.
If the point is to represent a particular time and place in history, then one should take pains to be correct in details. Some people have taken their ML interests to the next level by researching the details of the original guns and some have taken the trouble to accurately recreate them. I am not there yet in that I have made several mistakes through ignorance, but I am working towards more accurate representations.
CS