That is interesting work, I have some registration routines I can share with you going forwards with this.
Are you attempting a super-resolution output from the result?
Two different telecines will capture details that is missed on each on its own.
Fine detail data may land on a scanline on one transfer and not on the other, and vice-versa. It should be possible to recover both lots of data and end up with a better capture than either of the originals at a higher resolution.