i agree. the engine/turbo conversion if fairly straitfoward, but to make it AWD will require a lot of time, and if you dont plan on doing all the work yourself, alot of money.
Like stated above, i would buy a 94-98 VR-4 and do the 99 body conversion. Much much less work. Or, if you have the money, you could try and find a 99 VR-4.