Will look at te file shortly, but to comment on the BMP, BMP beign a pixel x pixel format is about as good as it gets without using scaleable vector format, (which you can't do for an image), 800x600 is too small for a good quality image with lots of detail, plus taking off the white space in your pic, and you have an actual image of around a tiny 480x400.
Are you after a still image Daz or just increasing the quality of the animation ?,
Hmm, looked at the file, AL doesn't like having camera look by path and camera position by path, both using the same path, the camera can't look at itself so picks an arbitary view. also you really need a cameraUp 0 0 1 as well to tell the camera which way is up.
Select make copy tool, and click the spline, tab to scale x and go with something like 5, use the same for scale y and scale z, turn off make copy, change the camera position by path to use this new spline, add a cameraUp command, see how it looks, splines especially helix type are awkward to work with.
When I originally did the wiki, I skippped over mobile camera stuff because most often they didn't do what I wanted, even now I can't get Camera Up By Nodes to do anything predictable so can't write anything about it..
The $AnimConstruct appears to be like the $constraints layer (which stores block marks), TC/AL is using it to store its internal stuff.