I am welding (sticking lumps of hot metal to) my chassis and watching it curl up as it cools . My rolling chassis only goes round in circles you need arms like a gorilla to wrench the steering wheel to hold it in a straight line
I've been reading too many of those posts that warn against distortion as the welds cool -- having nightmares ,waking up screaming!
It didn't really end up like that or at least not as bad anyway. I got a slight curve ( I can see light between the bottom rails and the table top) but its good enough for me --I studied at the Bodgit & Rush Academy of Precision Engineering.
But wow isn't it great to stand back and look at it and say " I did that !" So if,like me, you feel a little less than confident, take heart , It will be all right on the night! (probably)