relocating hu face, wiring limitations?

This will be my first post
Ok I want to first mount my Alpine CDA-7965 head unit "guts" out of sight ...like behind the dash or Under the seat in a small enclosure (this is a dry unit-no on-board power so heat wont be a huge issue but I am mounting a small exhaust fan w/temperature controlled switch to be safe)
I want to mount the face of the head unit either in the upper dash or up by the rear view mirror..I havent fully decided yet.
<U>My question or concern is..that there will be a limit to how far from the "guts" I can mount the "face"</U> I'm sure there is a limit
*I will be using either 22 or 18 gauge wiring.
*I will not need access to the cd slot, I am running (2) 12 disk alpine changers.
*I know the motorized fold down face is awesome..but i'm sort of numb to it's coolness factor now.
*In case I want to disconnect the 2 parts I am using some of them radio shack Barrier Strips (2) 8 position....the HU has 15 contacts.

I figured I could find out myself by running the wires to length..and testing/cutting down, testing/cutting down and repeating over and over...but I hope this will be more helpful.

I think I put in all the info that should be needed..if not hopefully someone will ask and not ignore the question for lack of info.
Thanks for your help

I have done what you are attempting to probably 15 different radios over the past 20 years.  I use a ribbon cable manufactured by Belden cable.  I can get you a part number tomorrow.  The longest one  I did was a Sony at about 12 feet.  Have done Sony Kenwood, Pioneer.  The only one I could not get to work was an Alpine CDA-9827.  Only had to move it 3 feet.  Could not get it to work.  I think it was the only Alpine I had attempted.  Tried larger wire, still no luck.  Not trying to scare you out of trying it, but I would like to know if you get it working.

Thanks for the reply..I'll have to look into that ribbon cable for myself...Might be better than looming it all together.
I am looking for a way to efficiently contact alpine techs to ask them this question..Might be the only way to truly get this answered.
I appreciate you takin the time to reply...I'll let you know if I get it working