Reference plates

I created two planes that were perpendicular to each other and the same size to use as my reference plates. I created a material from the reference images, and set the self illumination to 100. I then assigned this to the planes and used a UVW Map modifier, with "Bitmap Fit" to ensure that the images weren't distorted.

I set these to frozen (unchecking "Show frozen in grey") and began work on the polygons.