I converted an old mtn bike into a touring bike with drop bars. I used bar-end shifters and aero brake levers. I was very happy with this bike. I did a respray with flat green spray paint. It was locally known as "the Green Machine." Unfortunately, it was destroyed a while back when I was hit by a car.
One thing to check is that you might need a new stem--both to get the reach right and because straight bars are normally 25.4mm and drop 26.0mm
Good luck,
Dave