Back View
A piece of 1/8" (3mm) thick acrylic was shaped as a base to fit under the box and cup holder on each side. It was bent down at the front to allow it to stand on the dash, keeping the base level.
A piece of acrylic bent into a flat bottomed "U" shape, then inverted to fit into the ashtray was screwed to the bottom of the base piece and box.
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Top View.
A metal box from IKEA was trimmed along the top front and sides to make it easier to see into. Two vertical slots were cut into each side.
Two hoops with a flat one one side were cut out of 3/8" (10mm) thick plastic and smoothed with a router.
These were then screwed through the slots in the sides of the metal box to allow the hoops to slide up and down to suit different sizes of cups and bottles.
Two cupped circles were turned out of the 3/8" (10mm) plastic and screwed to the 1/8" (3mm) base. These hold the bottoms of cups and bottles firmly in place.
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