I've been looking at this idea with my bad boy, but today decided that it's going to be too expensive for me.
I was wanting / looking at:
105 Sti levers $180.00
Swap my MTB disc calipers to Road disc calipers $80.00
New Rear deraileur (Deore long cage) $48.00
Drop Bar (used) $10.00
10 speed cassette $33.00
Chain $23.00
$374 !!!!
Came to my senses (for the time being) & asked the question, why would I do this when I have a road bike?
I had no answer.