Cut a length of 8-inch (interior diameter) PVC pipe that's roughly your height. This piece will have an external diameter of anywhere from 8.6 inches to 8.9 inches, depending on the grade of pipe. Heavier-duty pipe gives greater stability.
Put as large, 8-inch diameter, coffee can full of sand and gravel in the bottom to serve as the object's ballast.
Mark the holes in the PVC for the limbs you're going to use. They should be at shoulder, forearm, waist, and knee heights, give or take a few inches. The two arms facing frontward should have their points be about 8 inches apart on 11-inch dowels. The dowel holes have to be about 2 inches apart on the PVC.
Cut the holes out of the PVC trunk with a 1-inch spade bit on a power drill.
Make your wooden limbs out of hardwood. They should be about 2 inches to 3 inches in diameter and taper to conic points and be about 11 inches to 12 inches long. The leg is usually made of a tapered joint to give the knee its bend. Taper down the ends that attach to the trunk to fit them into the holes you cut earlier.
Attach the limbs to the trunk of the dummy.