This is a 1/16 scale compilation made from a set of drawings available at:
http://www.airwar.ru/other/draw/po2.html

The scale of this drawing is 1/16, and the format is TIFF, 150 dpi. The file is zipped. For rescaling the drawing to 1/33, change the dpi to 309.4, or resize the drawing to 48.5 percent. Key measures:

Wingspan, original: 11.420 m
Wingspan, 1/16 scale: 71.4 cm
Wingspan, 1/33 scale: 34.6 cm

Length, original: 8.170 m
Length, 1/16 scale: 51.1 cm
Length, 1/33 scale: 24.8 cm

When compiling the drawing, I have used the control gauge given in the original drawings. For very exacting work, you may want to check the dimensions given in the drawing to resize each part horizontally & vertically. This has to be done to each section of the drawing (side view, front view, top view, etc) individually, since they stem from different originals.