Your project may be practical if you are able to find a pair of heated sports seats that you could swap in and were willing to do the labor yourself. You would then have to sell your current unheated sport seats to recoup part of your cost.
I followed Dennis' instructions when I installed my seats. I agree that the instructions appear challenging, but I took it step-by-step and it the project turned out well.
The cost is another factor. I was able to find a pair of good used seats for $600 shipped and the seller included the switches and some wire connectors that resulted in a big savings. I also paid $100 to have an upholsterer swap the leather from my passenger seat to the heated driver's seat. So, in addition to the heat, I also have better-looking seats.
While I was originally out over $700 I was able to sell the seats I had left over and reduced my net cost to about $275. (Plus about 10 hours of my labor.)
The prices for parts and labor that Dennis quoted are now several years old, so if you used new components at today's prices I think the approximately $1200 he spent would grow to $1500 or more.
Good luck if you decide to do this.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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