Afraid I don't have that (the script) and the paint program doesn't have to be free, just the end product.
Here's the script I use. It goes in the baseoa dir. It's just a bunch of OA console commands but it makes life a lot easier. You can turn it on by execing it from the console or putting it in your autoexec.cfg.
\exec demo.cfg
You can go 3rd person in normal play but spinning the camera and zooming is cheat protected. You can access a map with cheats on by using the devmap command. (BTW, you can type in most of a command and then hit tab and OA will try an finish typing it for you) If I wanted to go to the oa_dm1 map with cheats on I'd type:
\devmap oa_dm1
The script I've attached allows you to enter and exit 3rd person mode by pressing the 'p' key. The camera is rotated with the left and right arrow keys, and zoomed with the up and down arrow keys. If you'd prefer different bindings, you can just open demo,cfg up in a text editor and change them to whatever you like.
There also some demo recording/ play back stuff in there which may or may not be useful to you.
Speaking of which, you can also rotate the camera in demos. Have fun
* Ughh... .cfg file attachments not allowed.
I've ziped it up instead. Just extract it and place it in the baseoa folder.