Having pondered over a eGPU build I instead decided to put my GPU inside my 15.6 laptop by extending the laptop base. I have a Dell optiplex 390 where my GTX 750ti LP once lived but as I now spend more time with my laptop on the sofa the Dell optiplex is now a donor for my gaming laptop build. I'm using the Dell motherboard for this build. It has a i5-2400 CPU - 8GB DDR3 RAM - MSI GTX 750ti LP GPU. The Dell PSU is too big for this build so I will be using a Seasonic SS-250SU 250W PSU. The laptop used for this build is a Fujitsu LifeBook AH530 that has a 1366x768 LED screen, this screen will be replaced with a higher resolution 1600x900 screen. The extended base of the laptop is now 6.5 cm.
Parts needed to complete the build:
Seasonic SS-250SU 250W PSU
PCI Express 16x Flexible Extension cable
LP156WD1 (TL)(B1) 15.6" LED 1600x900 screen
LCD Controller Board
Ultra slim keyboard with touchpad
Work so far in pictures: