I didn't find it particularly difficult to move the climate control. If I recall correctly, removing one of the HVAC ducts made it easier.
The challenge you face with a 2003 is that you are likely to have the MOST fiber optic audio system. I have a 2000 and my car has the simpler wire-based system. I don't have direct experience with the MOST system. This thread may help you sort out the issues associated with MOST: https://986forum.com/forums/boxster-general-discussions/75274-radio-confusion.html
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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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