I did it as a long trailer to hide the problems of working with found footage.
As I said to him ...
I have no doubt that a wonderful 2-hour adventure could be done with the Ten Doctors together, but to make it work, the KEY would be to shoot new footage with Doctors 7-10 and companions, and preferably get new voice work from 4-6 and companions. You can make old footage say something completely different than it used to, but it does require careful writing of a new "other side" of the conversation. Somebody call Russell T ....
I've put away the editing gloves on this one for now, but I would consider revisiting it in the future, though in a different way. I would do an opening act ... select clips from different episodes for all the 10 Doctors, showing what they're doing before they all meet. I know that 9 would mostly be Boomtown, 10 would be Rise of the Cybermen, and 6 would be In a Fix With Sontarans (as seen on the DVD). Stuart Humphryes just did a short colorized opening clip of the First Doctor which he intended to be the intro to a hypothetical Tennant episode ... stealing my ideas as I steal his colorizations. =)