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Don't forget labor: welding lightweight, exotic materials requires a lot of experience, as every imperfection in the weld will lead to it cracking with time, which would be extremely dangerous.

Wheelchair market is ripe for IKEA.

I don't doubt it, but just out of curiosity, could you elaborate the ways in which they're shit?

see my earlier post: https://news.ycombinator.com/item?id=41721976