Drill two holes, 2 inches deep and 2 inches wide, in each 72-inch log. The holes should be 15 inches from each end. Drill two more holes of equal measurements, but with this pair of holes 90-degrees to either side. These are the posts to your bunk bed.
Cut both ends of each 4-inch diameter log with your hand saw, 2 inches from each end, and 1-inch deep around the circumference. Chisel the wood off around your cuts so the 2-inch ends of these logs are 2 inches in diameter.
Drill four 2-inch diameter-by-2-inch deep holes in each 76-inch log. Space the holes so they are 14 inches apart, all along the same side so the centers are aligned.
Position two posts so they are standing upright, 72 inches apart, with one pair of holes facing each other, and the other pair of holes facing you. Place the ends of two 76-inch logs in the holes that are facing each other. The 2-inch holes in the 76-inch logs must be parallel with the floor, and perpendicular to the posts. Screw through the posts and into the ends of the 76-inch logs. Repeat this process with the other two posts and two 76-inch logs. These are the sides to your bunk bed.
Position the sides of your bunk bed so they are standing upright, parallel, and 30 inches apart. Place the ends of each 34-inch log into the holes of the 76-inch logs. Screw through the 76-inch logs and into the ends of the 34-inch logs. Sand down the bunk bed with the medium and fine grade sand paper. Wipe it down with the tack cloth and apply your wood stain.