MOT day is near and i took the van to the mechanic i use today. He told me that the back end is a definite fail and that most panels will need to be replaced. Pretty sure he was only concerned about the exterior panels as he said an MOT fail can be on a jagged edge that someone could cut themselves on. He said it is solid underneath when he had it a couple of months back anyway.
He also said i couldn't get the panels i'll need for the van to pass it's MOT and that i'll need to spend a grand or more getting someone to shape metal to fit.
I'm hoping you guys have some better news for me

Here are some pictures of all the bad bits to help you get an idea.
Passenger Side Rear:




Drivers Side Rear:




Passenger Side Engine Bay:


Driver's Side Engine Bay:

Here is some other pictures of obvious rust (please let me know if you think any are an MOT failure):

Drivers Side Windscreen:

Above Front Bumper:

Drivers Side Gutter:

This is my first van so any advice is much appreciated. I've got a mate who is a welder and is willing to help me replace/fix these.
Cheers.