Build a wood frame that is 3' on wood side and width of your door on the other. The 3' side will be the depth of your potting table. (modify it as you desire depending on how much work area you desire for your planting creations). The side that matches the width of your door will be the area that you mount the frame to the door. Your frame will be made with the 2x4's on their side, secured at the ends with 2 screws into each connection point.
You can begin by picking up some piece of metal you observe while driving down the highway. Highways and other community roads will give you a huge number of pipes, hubcaps, metal bumpers and other pieces. There are also aluminum cans scattered at the sides of the highway.

The internet being what it is these days you can sometimes find the part you want by searching your salvage yard open near me's website! A junkyard search like this couldn't be easier! You'll also be able to find the location of the junkyard and their hours. If you do query the search engines or yellow pages you might be surprised to find that there is more than one place you can look for auto parts near you. Just remember that looking for used auto parts isn't much different than looking for a used car. Check the classifieds too. All of these ways of looking will save you time and money.
Every state and town has at least a salvage yard where useful parts of dilapidated vehicles are salvaged for re-use. Most of the parts would be non-functional. But even the most dilapidated vehicles have a usable part either on the inside or on the outside.
If the vehicle is in working you could drive it to the scrap dealer or have it recovered there. Otherwise if this isn't feasible then the you could contact them and the scrap yard will come and collect it.
Both car enthusiasts and budget buyers have spurned the demand. So before you think of giving your dead beat car to a junk yard for scrapping it, consider this option of selling it to a car salvage company.
Now it is time to remove the circuit board. As auto salvage yard near me have mentioned in other articles, this board is a low grade brown, which is the lowest on the scale of circuit boards. They sell in the area of.50 per pound to many scrap metal yards. Getting the circuit board off is simply a matter of looking for screws or pulling apart a couple of tabs. You will likely have to clip a few wires along the way.
You will need a way to haul this metal away and trade it for money. Depending on what type of metal and what source you are targeting, you may need special tools to remove and load the material into your truck or hauler. A small truck jib crane can be easily outfitted onto most vehicles to swing heavier loads for hauling. Your hauler will take a beating from this business. Scrap metal is not friendly to painted surfaces or anything you want to keep nice looking.