HVAC, heater core, radiator fan or two, AC condensers, window gear, should add up quite a bit. Once the window gear is out, gut the doors (keep the impact bar but remove the whole face that the door panel and window motor & rails used to mount to, which is no longer needed).
Depending on how you feel about losing them, the bumper bars (really the mountings for them) are surprisingly heavy.
My SPB has been an at-home DIY effort from my new-purchased Boxster, other than the roll cage, and without doing anything about excess wiring or heavy battery it's within 40 lbs class weight. It'd be better if I lost a bit more so I could run the cool suit box and still be close to weight.
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