I have spent my life trying to figure out how to fold metal not cut it. I have it down to a science. I can even do a outside corner with just folding it. try wrapping you mind around that one. It can be done, no cuts at all. Maybe some day I'll share how ;)
I can see the advantage to that method of a folded corner if you're not trying to slide under existing counterflashing and wall cladding.
The criteria I always use for whether to build a plywood cricket first is whether it could be stepped on and collapsed.
For some reason, I can only upload one pic at a time. Here's another one neatly done.

Here's a neater one. It leaks though.

I little dulled out. I only use 20 oz. for this, so it doesn't lend itself well to 'neat' sometimes. I just remind myself 'It's a roof, not a showpiece and it must work more than anything else.

Can't get much neater unless I don't bend it at all. Even then, copper has distorted reflections like leaded glass has. Once it dulls in a few days, it looks good.
Frank, you are too good, too original, too experienced, and too, what can I say, righteous maybe, to post up pics with copper crinkled up like that. Dress it and make it graceful while you are at it. I know you can. Exercise them tongs.
We did too, until we realized we only had to fold the pan correctly and the wood work became a moot point. This half cricket is about 3" high in the corner. Nice valley, nice kick out and less than 1/2 the time. :)
Seriously though, I don't run into all that many of those.
When I do, I like to build a half cricket in behind the chimney using 2 x 4's and a small triangular piece of 3/4 inch plywood creating a little valley.
Origami with copper, love it! B)
:laugh: :laugh: :laugh:
When I'm fishing for bream, the bobber keeps moving around a little but never quite goes under the water.
After a little while it just stops moving at all so I reel the line in.
The only thing left on the hook is a half cricket. :huh: