Well, I did exactly as you guys said in your posts.
I created the folder /Volumes/EFI/kexts/10.10 and put FakeSMC.kext in there, added HFIPlus.efi in the drivers folder, updated Clover to revision 2953 and ran the Install Yosemite app.
On reboot I selected the Install entry with inject kexts.
From there it took several minutes loading stuff.
The last things I see in the console are:
IOGraphics flags 0x43
Sound assertion in AppleHDAController at line 556
Sound assertion in AppleHDAController at line 413
Next thing that happens are that the console disappears and the screen displays the apple logo with the progress bar underneath and the cursor in the corner.
The cursor quickly switches to spinning ball and stays that way, though I can still move it.
After some time the mouse becomes much less responsive, and the progress bar never actually progresses.
I tried safe boot and I also tried deactivating graphics injection, but no change