haha! I assumed it was thicker because u mentioned the 24kg servo =)

The fan is interesting... custom, or original mounts mate?

I also notice you have raised the motor mount plate... how high have you raised it, and are the spacers only on the screws? I was considering this also to make room for my packs, but was unsure if i should make up a whole 'plate' or just use some spacers on the 4 mounting screws...