Also, the lock panels are too wide. You are going to have to take wood off the front, back, top and bottom. I wouldn't leave more than 1/2" at the front and rear (between the front and rear of the lock and the front and rear of the lock panel) and as skinny as 1/8" at the top and bottom. The mortice around the lock should be pretty skinny. You don't want a lot of flat areas left on a rifle. Take a look at the lock panels on some of the originals in the Library.
As to the forearm. The side walls (between the barrel and the outside of the forearm) should be no more than 1/8". As Dennis said, I am sure you have enough wood to remove. I still leave too much wood there sometimes. Also, the forearms should be well rounded, kinda egg shaped. It looks a little flat the way it is. Wood can be removed above and below the centerline of the lower forearm. You round the sidewalls up to a fine edge at the barrel. You really need to put your hands on a good rifle to get a feel for what the wrist and forearm should be like. It is hard to tell the shape from photos.