I'm pretty sure this guy will have to do a dual ear and beefier reinforcements given he's dropped a V8 in it
The problem is commenting when you don't know anything else about his project. Looking purely at the video it looks like he doesn't really have much of a clue - but that could be an incorrect assumption.
As for the movement of the diff, it's exaggerated because of what looks to be a failing bush. He either knows about it, and some accompanying text would show that - or he just chucked in a big lump, stood back and then popped on his rose tinted specs. Or he stood back and realised that he probably should have done more work.
It's certainly not pretty what he's done in the trunk, but function over look is OK if its your own car.
The question is whether with a new OE diff bush (or perhaps uprated one) the video would be less dramatic. That said, things are designed to move around underneath, so I'm not really sure that the video really serves much of a purpose. If things weren't meant to move around, then they wouldn't be using rubber bushes on them...
