Here are the specifications on the widest 4x5 pinhole cameras (film width = 127 mm) I have made:

Cardboard Box (flat film plane)
0.0126 = pinhole diameter in inches
0.320 = pinhole diameter in mm
2.2 = Pinhole to Film Distance in inches
55 = Pinhole to Film Distance in mm
132 = angle of view

Mailing Tube (curved film plane)
0.0126 = pinhole diameter in inches
0.320 = pinhole diameter in mm
2.0 = Pinhole to Film Distance in inches
52 = Pinhole to Film Distance in mm
140 = angle of view

Mailing Tube (curved film plane)
0.0102 = pinhole diameter in inches
0.259 = pinhole diameter in mm
2.0 = Pinhole to Film Distance in inches
52 = Pinhole to Film Distance in mm
140 = angle of view

All pinholes were Laser cut in .001 inch stainless steel.