Idling away on you tube and came across this chap - some good tutorials and information about restoration techniques which are relevant to the sort of stuff we get involved in.
www.youtube.com/channel/UCB8HF8Pqug-Pc7DFqX9lf_g/featured?disable_polymer=1
And one that covers the often requested subject of near invisible butt welding sheet panels - he uses an old school tranny mig just to show what can be done with cheap old school tools.