The cab corners were the single biggest repairs I did to my cab.
I had the theory,but had never actually carried out such an extensive and cosmetically important repair.
I
was a relative 'newbie' to this as well.(It's a steep learning curve!)
I opted to butt weld,rather than overlap the joins,I also didn't disturb the door reveal area,but stopped short and cut vertically just behind the door gap.
I just took my time,checked and double checked everything and got it done.
Here's a link to some pics,I think there's 13 in total.
Cab corner replacement.I hope these help.