I am building a 7 and have reason to have purchased the following:
longeron yoke
4" no hole
4" with hole
3" with hole.
Longeron gets you around flanges etc. a no hole is for tight spaces, and the 3" will fit is smaller spaces than the 4, stiffer too.
These still won't work in a hole where the rivet is close to the hole edge!
There are places where the pneumatic won't fit and only the hand unit will. It might be possible to just use the rivet gun too.
YMMV.
At times, I wish there was an alligator hand squeezer too.