Main problem with this laptop is overheating. Looks like everything is designed to fit just right, there's no place for any mistakes. Use best possible heat conducting materials (or use originals). Mind that NVidia chipset is not directly touching the heater - use heat conducting rubber (must be high quality), look for „thermopad”. Also remember that power supply (close to CPU) chips must be cooled too. Conducting rubber thickness must be well chosen so that all element are well connected with the heater.
When chipset is not cooled computer will turn off, when there's a problem with power supply heating computer will hang.