When my brother Stan fell ill, all my projects came to a halt. However, Stan would not want me to stop. While I'll never again use the lathe and mill to help him with his model railroad, there will be other projects. Therefore I have picked up where I left off, and am in the process of adding digital readouts to my Mini Lathe. Already heavily modified - see my Feb 18, 2010 post - the DRO will enhance it further.
It extends past the compound slide in both directions, but does not interfere with the hand crank or the toolholder. Like the cross-slide scale, it has to be removed to adjust the gibs, but removing only takes a few minutes.
After a lot of thought about how to best add the carriage scale, I designed the mounts seen below. They fit snugly underneath the lathe bed, and use a pair of 8-32 screws to secure them in place. After machining them, I hand-filed them in spots to make them conform to some irregular spots in the sand-cast bed.