I've never done this myself so I might be wrong but from what I picked up over time it should go like this :
First of all read this topic to find a list of what field model goes with whom
http://forums.qhimm.com/index.php?topic=4774.0 and perhaps get a bit more info.
You'll basically need to exchange the files of reno with cloud, etc. by renaming the files to match.
To do so you'll need to get LGP tools and find the char.lgp, extract it, change the files around and repackage it.
If you need more info, search for "switch field models".
Also, if you want high quality field models, I'd suggest
asking the authors of the "Phoenix Rejuvenation Project" if you can use their models for the Turks since they've ripped the battle models and modified them for field use.
But that's only for the field models (in towns etc.) and not battle models nor World Map models.
You'll need to do the same for battle models (battle.lgp) and world map models (world_xx.lgp where xx stands for your version (ex: us)) afterwards.
I recommend you do a search for 'battle model switch" to get more info about that. I do believe its a similar process but you have animation files to worry about as well and limits might be screwed up. As far as I know, there's no current way to easily change the limit breaks. Look around for more info.
Also, English is obviously not your first language so I understand if you don't speak perfect grammar but I would strongly recommend you at least try not to write in bold and write as well as you can. It won't get you help any faster, quite the opposite actually.
Also, I'm not 100% on this but I do believe somebody already released a Turks patch. You might want to do a search on that as well as that would save you a whole lot of trouble and time.
Good luck.
