I had thought about using flex like that, Hank.
Can't remember where I read it, but recall that it was not great to use them in the j pipe.
I think it's a good idea to allow for misalignment in my dodgy fabrication 😂
That read would be interesting to view.
Reason for the flex joint is not because of misalignment of the pipes, it is used so your "J" pipe won't crack.
Also, flex couplings reduce premature cracking of manifolds and downpipes and help extend the life of other components.
It looks like your are mounting the turbo bracket solid to the block.
Your exhaust manifold heats up, expands, cools ,then expands, etc.
So @ the point where your pipe attaches to the exhaust manifold, to your solid mount for the turbo, there will be expansion & contraction of the "J" pipe, could cause cracking of the pipe, just trying to help you out.
Good luck with it.
As far as flex joints are concerned, there are good ones for turbo apps & bad ones.
You do not want a flex joint that has a metal mesh on the inside, (like the outside is), those have a tendency to get all distorted & collapse on the inside & will cause a restriction.
Here is an example of what not to use:
https://www.google.com/search?q=flex+coupler&biw=1600&bih=796&tbm=isch&tbo=u&source=univ&sa=X&ved=0CD4QsARqFQoTCMeYjbyo3sYCFUEwiAodK70Mgg#imgrc=ljVcfSj0KpDJLM%3A
https://www.extremepsi.com/store/product.php?productid=27808MBHD
