JSR raised the possibility of using the cadastrals on top of the title maps. I've looked at the GeoTiffs created by AC, and determined that I can use gdalwarped like this:

gdalwarp input.tif output.WGS84.tif -t_srs "+proj=longlat +ellps=WGS84" 

to create a version in degrees in WGS84; then I can use:

gdalinfo output.WGS84.tif

to see the resulting coordinates. I think we can then use convert to get PNGs and use ol.source.StaticImage to put the results on the map, but I haven't actually succeeded in making that work yet; still wrestling with it.