Skwrl

You should have just put them where it said to.  You don't have to overwrite the default models. Any patchday later than where the model exists will work.
 
Anyway, if you really want to overwrite police3, it would be in patchday4ng. OpenIV has a search feature, Ctrl-F3. Type police3.yft in the search field and you'll see the model is in patchday4ng, then double click it and it'll take you there where you can overwrite it.
 

So, I thought I would ask a pretty simple question: How do you play LSPDFR? Do you use Mouse and Keyboard, combination of gaming controller (I.E. Xbox Controller) do you have
a secondary mini (action) keyboard?
 
I ask because I'm fairly new to the game, not GTA V in general, but new to PC. My last PC that was worth its salt was back in the Battlefield 2 days. Ever since then I've never ponied up for a PC. Now back in the PC Gaming world, I find LSPDFR to be extremely immersive. Installing dozens of mods, there is so much to remember as far as keys go.
 
I have been using an Xbox controller and alternating back to keyboard. I feel like a gymnast throwing a finger at the keyboard while trying to maintain the controller.
 
Now, I'm sure you can set key commands to make it easier, I would love to see how you have it set-up!
 

GTAV.
 
And use a mods folder.
 
http://openiv.com/?p=1132