The logo replacement is one of the easiest and brick chances are lowest (I don't know any). But SoF used an older 3.12 version of MMTool. I use 3.22 for AMI8.
Checked what SoF has done - looks fine. But when I opened his first picture version and clicked "Save for Web" in PS it made the file 22KB while his second was 29KB. Anyway it's nothing, nice work!
The AMI logo (that's the same place Award EPA logo is) can be replaced too but it's harder to make a replacement logo (that odd format doesn't give much freedom for design).
So this Massman Edition BIOS is a present for Massman?