Mabuhay from the Philippines!
Hello! I am Conrad Delta. I have a 2012 Asus K43SM whose dGPU was failing back in early February this year, and I wanted to at least salvage/preserve my laptop.
And after about three months of pondering what to do, researching about eGPUs, looking for (second-hand) parts, and finally gathering all the courage I could muster to make the build, I have finally built my eGPU setup - and wrote my build here! It's currently disassembled though since the eGPU I used was only loaned from my brother, and I have already returned it. I do plan on buying my own GPU.
I don't mean to give false hope, but... If I am not lazy, I may try to use the same eGPU setup but with a Lenovo Thinkpad X240. I saw there are already guides for X220 and X230, so I am kind of assuming that it's applicable to the X240 as well. But it looks like Lenovo laptop eGPU builds are not as straightforward as the build I made for my Asus laptop (which had no reconfiguration required, e.g. for the BIOS), so that may take some time.
Anyway that's it!