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Welding, little to none(haven't done any in 10 years). although i work with a few ppl who are good welders.
I'm a machinist so i can make pretty much anything bolt-on :p
Still need to have a good...

In my opinion, if its just for bikes(and you'll never tow anything heavy) you could get someone to custom build a light duty one for your bike rack... when i eventually get my car i will work on...