I never use plans.
The architecture of every gun is determined to a large extent by the parts. It is better to start with the correct parts for a 1770's Dickert and go from there. If you have a buttplate that is flattish on the shoulder, 2+" wide, and 5" tall, the correct guard, whatever lock you intend to use, and a barrel with some real thickness in the breech, it's easy to draw your own plans so they come out "Dickert".
Lay the barrel on a long sheet of paper, maybe brown wrapping paper.
Figure out where the touchhole will be.
Now you know where the lock will be.
The lock determines trigger placement. Figure where your trigger goes, and the guard.
Now you can place the buttplate for the length of pull you want and the drop that would be suitable for the shooter and look right on a Dickert.
Now look at several Dickerts in books and see the relationship between the trigger guard, wrist length, and nose of the comb. Note how high the comb is when it meets the wrist.
Look at several Dickerts in Rifles of Colonial America and for the period of interest, figure how long the forearm should be., length of nosecap (generally= length of thimbles), and where the thimbles will be placed.
Within these constraints you can now apply Dickert style and sketch in an outline of the belly of the gun, the line from triggers to the toe of the butt, the comb, the wrist. All those things are dependent on the parts you choose.
ONCE I made the mistake of buying a precarve stock, then trying to make all the parts fit the pre-conceived plan. Lots more trouble than making my own plans.
If you use a different thickness barrel, shorter or longer lock, triggers, guard, height or width of buttplate, all those will confound your attempts to build using a printed set of plans as your guide.
