You are correct, this is the Current River style boat. My grandfather got the plans in Doniphan on the Current River in about 1920 and hired local boat builder from near Steelville. These boats were built on the site where they were to be used and launched. It usually took a boat builder about a week to complete the boat and 2 paddles. Ours were always 24' x 4' (width at the center) tapering to 18" at the bow and stern. When completed they were sunk for several days to swell the wood and close any leaks. It took 5-6 men to roll them over and empty them and they would then dry for several days in the sun. Total weight was about 250-300 pounds dry. I watched the last one built in 1960 (I was 13). They used local woods; sassafras, hickory, and some quarter-sawn white oak where straight grain mattered; like gunwales.
In 1960; the price of the wood was $47.50; labor was $100; total $147.50. In 1960 the bottom was made from plywood. Prior to that the bottoms were planked. We had boats built in 1906 (gig boat), 1921 (lost to flood), 1930, 1947 (broken on truck from float return trip), 1952 (lost to flood), and 1960 (sunk in 1969). Total price in 1921 was $38.00.
All of our boats were built from the same pattern; except prior to 1920 we uses gig boats to float (see picture under Current River forum). They were up to 28' - 32' long and only 2-3' wide at the center with an up-swept bow and stern.
As far as the pictures go; top left is our 1930 Jon Boat in the 1930's our boat at Huzzah Meramec junction; next to right is our boat in 1949 at Saranac Spring riffle, next to right in beginning of 3 boat float at Onondaga Cave before the bridge in 1926, next to right is the hog trough at the town of Scotia on the Huzzah Creek about 1947, next right is Maramac Spring Mill prior to 1900, and last is inside of Jon Boat in 1937. Dates on picture back.
Getting them back after a float was hard to do without a trailer; usually on a long bed truck with additional oak 2X4" 16' long under the boat for additional bracing to keep them from snapping in half on a bumpy gravel road.
Posted here is a 1914 boat on the Meramec near Onondaga. Notice planked bottom.