Elviento has a good point.
I have recently built 2 bikes to this principle; a drop bar MTB and a friend's hybrid (Scott Sportster) converted to a drop bar touring bike.
As you said it was an older hybrid frame, you won't have disc caliper issues, but the front XT derailleur will not work with the shifters.
After a LOT of p***ing around with an Umlenker and various MTB derailleurs to acheive the required top pull, I finally settled on 2 different solutions.
For my friend's Scott I used an Ultegra front derailleur with a pulley down below and FSA Vero compact cranks. Rear derailler is a Microshift long cage MTB.
On my bike (Mosso MTB) I bought a Microshift MTB derailleur, hacked it apart and drilled a new anchor point for the cable. It works perfectly and only cost $13 and a bit of sweat. This runs with An FSA carbon MTB crank (2x9). The rear derailleur in this case is a 105 short cage.
The easiest setup to build is the pulley method. Forget the Umlenker unless you are able to run road cranks with a standard double bottom bracket, anything more puts the derailleur cage positon so far out that the Umlenker is no longer pulling at the right ratio.
The XTR rear should work with the shifters as you said it was 9 speed. A 9 speed RD will work in a 10 speed system, but the reverse is not always true unless a 10 sp chain is used.
I'll post up a photo of the Scott setup tomorrow (and see how long it takes someone to paste it into the Freaks thread).
Best of luck, and Happy Bodging