It has the nifty fullscreen logo but I want to make an Aperture Laboratories boot screen to replace that.

I have a fast CPU, fast SCSI hard drives, and a very nice videocard installed. The sole purpose of this PC is going to be playing "Portal". (I'll be doing the whole thing, Windows wallpaper, sounds, casemods- a total Portal theme inside and out.)
I'd also like to replace some of the text with Aperture Laboratories and other stuff from the game.
Finding utilities to mod AMI bios files seems to be a bit difficult. I know this can be done because CheepoMan already did it back in 2004.
This is the BIOS I used. http://k7jo.de/bios/chb0811f.zip