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I agree, a fall pad is the most important component for any kind of climbing wall! But it will be the most expensive item on the supply list. A 4'x8' 2in thick pad starts around $150.
Wow! A real labor of love! Impressive job!
Beginning to MIG Weld
Welcome to Welding
Welding Tools and Materials
OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator
DIY carbon tape heated vest