I made this today! All in all, from deciding to make it to getting the lumber, to finding everything I need at Home Depot, to getting it cut there, using janky tools to put it together, took about 2-3 hours. But it's so worth it! Even at full price, the lumber I got, which was 2"x12"x8' (2 in x 12 in x 96 in) cost me about $25. Way cheaper and much more gratifying than those super crappy and scary plastic ramps. I also did the oil change on my driveway, which had a slope of about 1-2 degrees, and drove the car onto the ramps with the car facing downhill. This gave me a few more inches and it actually felt quite roomy under the car