You can build and create your own eboot here:
You must login or register to view this content.
In order to put it on your PS3, you need to use FileZilla to connect to your PS3. Once in FileZilla you need to open the folder thats called dev_hdd0 and then open the game folder. Once in there you need to find your MW3 BLUS/BLES folder and then once you find it, you open it and open up the folder called USDIR, this is where you'll place your newly created eboot. If you still need help don't hesitate to message me!