Anything where self tapping screws are fixed into plastic has a limited number of Disassembly and rd-assembly cycles but with care you can do this a few times. I've had my old PSR3000 apart at least 5 times due to LCD and keyboard issues. There is a specific type of plastic grease you can use to keep the keyboard smooth.

When reassembling take care to find the original screw thread in the hole and preferably hand tighten everything but not too much, you do not want to strip the plastic thread. And always put the same screw back into the hole, When tightening screws remember that if it feels tight straight away you've probably got something wrong. Similarly if the screw gets tight before any gap has fully closed then you've got something stuck in the gap!