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It will cost you in the sense of the PSU and screen which are rather specific items (if you have a DC-DC psu just laying around the house as well as a 7" touchscreen, lucky you) as well as the replacement dashboard parts you'll need after hacking up your originals.
Still, all the answers to your questions are on this site 10 times over. Use the Search button, read the FAQs, then make up your mind how far you want to go.
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