You say you want to build a giant robot? What is your purpose? World domination? Your girlfriend wont get that beer for you? Whatever it is, here is how to get started on building yourself a robot.
The purpose of this robot was for a stage prop for my friends and I 4th annual ROBOT PIRATE NINJA party. We got Pabst Blue Ribbon Beer to sponsor our event and with a budget of $300 they wanted a PBR robot for the stage.
Here is a video advertising the event.
Here is a video of the robot build, costume builds and the event.
Using your imagination, you can find everything you need to build a robot. From using old boxes and spare parts, you can customize your robot with things you already have or can acquire for free. Taking apart some car headlights, getting free cardboard at an appliance store, figuring out what you already have and what you can do with it is half the fun. Have a flashlight and a camera lens? make a projector. Mocked up a robot claw but found it didnt work out? use it as a stool.