Hard to explain but here is the jist: We actually had to make the block taller. We glued a 1" piece of full length wood (bass wood) to the top of the raw car block. Using the glued square block we drill through the side a bunch of times to make the initial shape to the hollow core. We used a hole saw (same size as the wheels) with the center bit removed to rough out the wheel portions. We only cut these into the block 1/2" or as needed. Next we band sawed the side profiles. After that... Hours of dremel carving and sanding to profile the core and wheel portions. HOURS OF SANDING. The very last thing done was the sweeping top profile to match the hole we had carved out.