Rustwelding golf mk1/ caddy mk1

Hi do anyone have experience om welding under golf mk1? Which metal parts is needed? Could someone help me find out which parts those pictures resemble to?


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Hello, any updates on this? 

What a silly place to put your axle stand in the 1st picture with all that rust…  

Looks like you need a
sill,
 a floor pan,
 a jacking point,
and fabricate the rest.