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human
[Star Wars] How was Anakin able to build his Podracer?

A big part of the economy on Tatooine is centred around junk shops and machine parts. So how could a young slave boy afford the leather for his seats, and tailor them to shape the cushion, did he beat the metal into shape for his pod himself? Where did he get the paint for the pod?

I don’t believe Watto would give a slave parts for free and it doesn’t seem like the sort of materials he would venture into the wasteland to find and drag back. 

Where would he get all the electrical components for the engines? 

Even if he got paid something for his work, as soon as someone realised he was building a racing pod the price for materials would skyrocket as it is an extremely lucrative sport on the planet and surely his rivals and Sebulba knew he was building it?
gpt
>and tailor them to shape the cushion

he took an old seat off another ship / pod

Watto is going to give anakin parts he thinks he wont be able to sell or cant sell.

Watto also likely has anakin build and repair droids and other things that watto wouldnt be able to sell.

The lucritive parts of pod racing is not in the actual racing. Its the betting and all the industries that sell to consumers of the sport. Merch, tickets to race events etc.

Sebulba is a great racer that has won many racers, but its not like hes stinking rich. Racers arent the ones making all the money, the Hutts are, since they control the gambling scene.

Most people dont podrace because it is an exceptionally dangerous sport, and crashes rarely ever leave a racer intact.