Flattening a scanned book

[Krikor]

What I did was the following:

01- I reproduced the steps presented by denzjos in post #18;  ( With this I created 3 paths: Top, Bottom and guides vectors )

02- I duplicated the paths (Top and Bottom);
03- This left me with 4 paths - Top, Bottom, Top copy, Bottom copy and Guides vectors;
04 - I applied the Replicate path by affine mapping plugin, between the paths: Top and Top copy, generating the Top replicate path;
05- I applied the Repliacte path by affine mapping plugin between the Bottom and Bottom copy paths, thus creating the Bottom replicate path.
06- Finally, I applied the script provided by rich2005 - Distortion Correction Between Paths  (on the Top repliaction and Bottom repliation paths) ... and voilà

This way it was possible to follow the steps given by denzjos and get the script working correctly.