Mini bike frame made from mild steel

#1
Can you build a mini bike out of square tubing mild steel? I know it’s probably not ideal, but say for a budget build? If so what size tubing do you think is the best for this? Size and wall-thickness?
 
#2
Are you going to bend it or will it be all welded?
Edit:
you absolutely can make a square tube minibike.
round tube is much stronger, so for square you would need to go with a thicker wall in square which would be significantly heavier.
just IMHO
 
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