How do you "remodel" or "update" the interior of a car?

Impractical. Such things are normally only done with classic cars or hotrods. Making a dashboard would be an expensive engineering proposition.

The outlay involved in building a custom car can cost more than cost of several new cars.

Dash: $100’s – $1000’s (dashboard cover would be a better idea)
http://www.autoanything.com/dash-kits/20A52301A1.aspx

http://www.protectiondeals.com/covers/custom_dash_covers.aspx

Steering wheel: $50.00 – $100’s

http://lmgtfy.com/?q=Custom+steering+wheel

gear shifter:$10.00 – $100.00

http://www.autoaccessorystore.com/resource/shift-knobs/knobs1.asp

http://www.slickcar.com/shift-knobs.asp
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Try to find a “custom” automotive shop in your area, they can give you a price list.

There are a million different things that you cand to you ride that look great(if you want to spend the money) I have a friend that did his whole car, it cost around $75,000.00 in the end.

What @tyrantxseries says. Also, go visit various places like O’Reilly’s and Auto Zone to see what simple things are out there.

You can also look into reupholstering the car (get a bid from a car upholstery shop) or getting a new roof liner put in (I had to do that, and it cost me about $100 but could go higher depending on what fabric or finish you choose).

Call Xzibit!

pimp your ride bro

I would normally take it to the body shop :).