I know how thick chassis's are, the company I worked for made truck and bus chassis and axles. I maintained the machines and equipment that made them. Personally I don't let anyone do anything that I can't do myself and if I was building a van for myself I would be doing everything ,but that's just me.I never implied anything as this thread isn't about you or what you welded.
You mentioned the welder in the photo ,you then said " i thought you were a coded welder " with that emoji that suggests you somehow doubted that fact.
I then explained the welding plant in the pic isnt up to the job AND that despite i was a coded welder ive not done that work in over 15 years ....
Hence why id prefer to get that job done by someone else .....safer than it failing and potentially causing an accident.
I didn't think it was hard to follow but i dunno it seems unless you type every detail like giving evidence in court theres always some bugger looking to pick holes in it.
The chassis is 10mm thick the bars coming from that to the rear of the van for the platform to sit on will need to be a similar thickness.
Compared to the body panels which are 1mm thick thats heavy duty and a 160 mig isn't suitable for doing it ....might leave a nice looking weld but the penetration will be shit.
Sure as the Sunrise.