Hi Norman,
You are doing very well. The carving looks great. Make sure you look at your beaver tails from the top, bottom, and back to see if they are symmetrical on both sides. Having said that, however, there is no real need to obsess too much about symmetry because you can only see one side at a time and most original guns show differences. I typically just try to get them to look mostly the same and let it go at that. EC121's little marking jig works well as long as the fore stock was shaped evenly along the ramrod channel. That is where Kibler's kit is really good because it is shaped very precisely. Where marking jigs have trouble is when the sides of the stock are not even along the ramrod channel. That often is the case with stocks shaped from blanks with planes and rasps. The marked line ends up a bit wavy and you have to go back and straighten it. When you are carving, I urge you to use a single bulb lamp held at low angle to the wood. That will show up the rough spots and uneven ground.
dave