Professional Nav system advice needed.

Been a lurker here for a while, and figure ya'll are the most knowledgeable people to ask. I've asked a couple of local big name install places about this, but have been advised against it.I have 2 Land Cruisers. One is a '00 w/out nav. One is an '02 w/ factory nav. We're going to sell the '02. What I would like to do is strip the OEM nav from the '02 and put it in the '00. I've seen the Toyota schematics and it looks like the system consists of the head unit, dvd drive (under passenger front seat), dvd changer (center armrest console) and several antennae. To further complicate things, the '02 has the factory JBL system and the '00 has the stock system. So possibly an amp swap would be required.Lastly, of course, the '02 would then need to have the '00 stereo/hvac units installed from the '00.My questions/requests for advice are these:1) Is this swap doable?2) If so, what kind of labor expense would I be looking at?3) Where would I go (I'm in houston, tx) to get this done?Thanks

Buy an after market Nav unit. There is too much involved with this. Not only the items that you mentions, but also the main brain, control modules that tie into the OEM computers for speeds, and anything else. I have done this for 10 years and would turn it away. You mentioned AC controls were part of this? Not worth the headache. Hope this helps. Chris