[sailingdog]

The issue you'll have with mounting a traveler higher up is strength. The taller the traveler base, the more leverage the sail will have against it... and the stronger the engineering has to be... a track mounted directly to the cabin top and bolted every four inches is very strong... mount the same track elevated by even four inches, the mounting system needs to be built up a great deal to handle the leverage it now applies.

 

[sailingdog]

Jeff's point about the mid-boom sheeting and how most mid-boom setups have a heavier boom spar is a good one. Moving the mainsheet attachment point forward on the boom can be an issue.