That's looking good! Those are the same switches I'm planning to get from New Wire.
The throttles are accessed from the center access panel below the wheel.
PXL_20221009_192750051.jpg
The cables will need to be removed and then the housing can be unscrewed. I don't remember if the screws are accessible from the access panel or if the housing cover needs to be removed (or both). I've looked at it a few times, but haven't tackled that one yet.
viewtopic.php?t=6487 has good information about cable replacement.
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