Rear crossmember, front dumb irons, footwells. Top of the chassis rails. Actually all the chassis.
Take a torch
Get underneath it and look carefully for rust, or swelling of seams and joins or splits in seams. Feel the areas you can't visualise, they should feel smooth not pitted or holed. Look inside and outside footwells, lift carpet to look at them.
If it has repairs on top of repairs all over then the chassis is likely done for. Take a screwdriver and prod suspect areas, if it goes through then it needs fixing - either negotiate price or walk away.
Bulkhead corner either side of the vents should be solid, look for paint bubbling around the hinge. Look at the seams inside the engine bay on the firewall and the passenger compartment footwells for rust swelling. Look at the bottom of the bulkhead sides
Oil leaks, pita ones are front and rear crankshaft seals - easy to do the actual seal but you have to take off a shed load of stuff to get to them (gearbox etc)- a slightly wet engine underneath isn't anything to worry about. Diffs/wheels hubs etc are an easy fix.
Insist on seeing it from cold so you can assess starting performance. Note exhaust colours when starting and driving, shouldn't be any blue (black grey is ok)
Some pointers, take some photos and post up anything your not sure about.
Do you have any mechanical skills etc?
Its up for £3500, i think its more like had some chassis welded onto all the patches. Gonna keep on looking, it is the first one I've looked at.
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