Lay a 45-inch board flat. Find the center, which is 22 1/2 inches away from each end and two inches away from each side. Drill a 1/2-inch hole through the board at this point, and repeat the process with each 45-inch board.
Lay a 45-inch board on top of another one so the two holes are aligned. Insert a bolt through the holes with a washer on each side of the pair of boards and turn the nut onto the bolt with your wrench. Repeat this step. These are the ends to your log holder.
Position your ends upright. Spread each of them using the bolt as a hinge so they form a 70-degree angle. Space the pair of ends so the outside edges of the 45-inch boards are 36 inches apart. Screw a 36-inch board to the 45-inch boards so its ends are flush with the sides of the 45-inch boards and so its top edge is underneath the other two 45-inch boards. Use four screws for each 36-inch board. This connects the ends together so they can stand freely. Repeat this step on the opposite side.
Screw another 36-inch board to the 45-inch boards so it is parallel with, and below the first 36-inch board that was screwed. The bottom edge of this board should be flush with the bottom ends of the 45-inch boards. Repeat this process on the opposite side of the log holder.