Build the base of your dolly. This will be the part where you will place your tripod. Fully extend your tripod's three legs, then measure the distance between the tripod's first two legs. Also, measure the length between the center of these two legs, then the length between this center and the third leg, which is located at the back of the first two legs.
Use a 90-degree PVC pipe connector to attach the center of the first two legs with two separate PVC pipes. Cut the two separate PVC pipes to have identical lengths if you bought them having much longer lengths than needed. As a benchmark, each should be about 4 inches longer than the extended legs of the tripod. One pipe will be attached on the left side and the other on the right side of the connector.
Connect the pipe connector with another long PVC pipe with a length about 4 inches longer than the distance between the center of the first two legs and the back leg of the tripod. This pipe will be placed on the middle of the two legs and the third leg of the tripod via the pipe connector.
Connect another 90-degree PVC pipe connector to the opposite end of the long PVC pipe.
Connect a pair of same-sized PVC pipes to the opposite end of the connector, which is the part where the third leg is located. This will be similar to the first two legs' connection to the first 90-degree PVC pipe connector, but this time, the pipes to be connected are significantly shorter in length. Each pipe can be about 4 inches long, which totals about 8 inches in length when they are connected together using the second connector. This makes a smaller T-shape seen at the back of the base, compared to the larger T-shape seen at the front of the base. As a visual description, your dolly when seen from a side perspective will look like a letter H with one vertical line significantly longer than the other vertical line.
Drill holes on top of the PVC pipe base so you can attach the tripod spikes (feet) onto them. Make sure your fully extended tripod legs are used as your guide on where to exactly drill the holes.
Attach a right-angle bracket on the side of each wood squares.
Drill a hollow onto the surface of each piece of the four small timber squares. The drilled surface can be about 1/8-inch deep and it should match the size and shape of your PVC pipe's end as this is where it will be attached.
Attach one skateboard wheel on each wood piece. Each should be mounted at a right angle to each other where the right-angle bracket is located on the timber. This means that for each piece of wood, there will be two wheels attached on a right angle to each other. With the four wood pieces, you will be able to attach a total of eight wheels to the entire base of your dolly.
Attach each wood piece to the end of each PVC pipe. Make sure the right angle brackets on the four pieces face the same frontal direction. The wheels should securely move the dolly base on the ground.
Place your tripod onto the dedicated holes you made on the dolly base, then attach your camera onto the tripod to test your homemade dolly.