Cut the fiberboard into 15-by-12-inch slats using a circular saw. Cut a 4-inch-deep "V" shape into the 12-inch side of each piece. Most hardware stores can do this work if you don't have a circular saw.
Drill two, 13-inch-diameter holes in the middle of each slat. The holes should be roughly 2 inches in from each edge.
Slide both M12 rods into the drilled holes of the six fiberboard pieces. Position the first three boards with exactly 3 inches of space between them. Make a 6-inch gap and position the last three boards with the same 3-inch lengths between. When it's done, there should be three boards at opposite ends of the rod. Secure the boards in place with the nuts and bolts. Tighten and apply the adhesive epoxy to keep the hardware securely in place.
Protect the steel rods with the heavy-duty pipe by cutting it into eight segments of 3 inches and two segments of 6 inches. Slice each segment lengthwise and wrap them around the rods. This will keep chainsaw blades from getting ruined in case they come in contact with the rods.
Wrap the ratchet strap around the piped rods. The strap can be moved depending upon the job being performed and is designed to secure the log or wood that is being cut.
Using the sawhorse is simple. Turn it over to use the "V" side for logs, or flip it to the flat side for wood slabs or planks.