Plus side. You know to what standard its been finished. Seen some truly awful pro jobs.There is a suitable welder in the 'For Sale' section, a 150 amp unit. Then, get lots of practice on bits of scrap before you tackle your chassis. Read the Mig tutorial section and find a reasonable source of gas.
Quite a lot of rot visable and you will find more...
If the guy can do that for £700, not bad. But you will get an education if you do it yourself.
Edit: Stalwart & I are on the same page.
Repair panels like a new subframe you mean??? CheersYou need to replace with at least as thick as what comes out. See if repair panels are avsavaila as it could save you alot of time.