(QUESTION)GPU Upgrade in laptop, yes as you read

Hello people
I hope that you are fine.
I have the opportunity to put the chip of an RTX TITAN at very good price in my laptop having a 2070 Mobile ,for about 247 dollars, with work done. What i need to do this? a custom vbios? match with 24 gb of ram in my laptop? how i do this to install a driver? just install the RTX TITAN desktop driver?. Far than machines and precise work, what i need in terms of hardware and software to run? i have custom water colling in my laptop running. I know someone that can do a custom heatsink for your laptop if you want this.

Best regards