There is good news!!! A multimedia interactive cd on the Brahadeshwara temple is already being developed by Cultural Informatics Laboratory (CIL) of the Indhira Gandhi National Center for Arts. IGNCA.
Unfortunately, it covers only the images in the front entrance and other Nayak paintings, it seems. Some important images and images of interest are as follows:
The debate over whether it is rajaraja and karuvurthevar or not was ongoing for a while in this group. Here are the concerned images.