Take it from me bro, it takes a lot of time money and ingenuity. Im the Perfrormance Moderator for the acura-legend forums and have done the auto to 6spd swap and the only to date 3.5 RL block swap. It took 4 months to figure out and do the block swap and another 3 for the auto to 6spd converstion. Lots of custom parts were fabricated. The NSX is even more of a challenge. I'd do it if i could locate a dirt cheap NSX engine.
www.2slik4u.com
~TRu Hybrid