Homemade Ply Boat Experts Please!!!!?

Experts please!!!!? - homemade ply boat

Experts please!?
I did a pull-up at home to my exercises is my plan to reach the center to put two layers of forest 7 feet in each segment, the flight of concrete mix and then add a bar at the top. My question is: How many pounds is required concrete mix?, Is for me?, How to Pour mixture of cement with water, it? And how long does it take to dry? Note: The wood is 8inch thick. The buckets are large and wide, 1 1 / 2 feet long and about the same in width.I am 6'3 240 pounds