I have made this in the past for the same thing ;)
Very more easy without script ;)
(don't refound the english version so here the translation :)

Décocher = disable
Pour une échelle de 100 = For a scale of 1 / 100

Draw a frame of 20 m * 28.7 (if scale is metter in SU) for be sure to have it in A4 format (21 * 29.7cm)

Disable Perspective in Camera view

In top view with A 4 format
Frame is well 20 * 28.7
Square is well 10 cm * 10 cm
Text frame is well 5 cm
Diameter is well 3. 68 cm

So Scale is good 1 /100

Just adapt for your own using ;)

Hi Alex - MoI does not itself have a 2D print function - to get better control over printing you generally need to export to a CAD program that has print functions and then those programs will usually have a lot of controls for the scale and stuff like that.

A couple of programs that can work well for that are Rhino (http://www.rhino3d.com/) or also ViaCAD 2D is an inexpensive option: http://www.punchcad.com/c-12-consumer-cad.aspx

It can be possible to do it with some view capturing in MoI though as well - see this previous thread for some details on how to figure out how large in units the width of a screenshot is:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4128.1

- Michael