It sounds like we may have the same unit. Personally I just drilled two holes (one for CO2, one for beer gas) next to the drain for the defrost, there was plenty of room to look under the back to see what we there.
JonW: I was doing some research to figure out how to make the shelf for my keezer when I came across this post; mine is nearly identical except I did six taps instead of eight and I used a stainless steel backsplash/drip tray combination. I actually think yours looks better than mine being...