I am currently riding a 2005 Brodie Energy hybrid. It has a flat bar and I want to switch to drops.
The front brake is a cable disc brake, the rear has been switched to a V-brake (a rack wouldn't fit with the disc). I know that there might be a compatability issue with either the brakes or derailiers (Front: 2203 for dual chain ring; Rear: Tiagara GS).

Would this be feasible with little cost, since I am looking to use STIs?