It costs more to buy the wood, nails, and wheels for this gravity racer, than most people paid for a cheap car before the mid 80s

plus the rope handle

Qty.4 X 3.5 x 4" pneumatic trolly wheels - take some of the bumps out of the road
Qty.1 X 1200 x 396 x12 mm Plywood BC boards
Qty.2 X 1200 x90 x 35 Pine beams
Qty.2 X Axle 'Adjustable Ambassador' 450-600mm 1/2in
Qty.4 X Mounting brackets (supplied with adjustable ambassador)
Qty.4 X Split pins
Qty.1 X Roll of clear vinyl tubing 16mm x 2 mm
Qty 1 X Zenith M10 75mm stainless steel cup-head bolt
Qty.2 X M10 Hex nutQty.3 X M10 Washers
Qty.1 X Roll10 mm Rope - partly for steering, mostly for dragging your cart up the hill
And as many 25 mm wood screws as you desire,we used around 20.



https://www.instructables.com/id/Build-a-Billy-Cart/
hat tip to https://www.hemmings.com/blog/2018/11/24/four-links-the-golden-gate-bridge-de-soto-history-diy-billy-cart-petersen-archives/