Please only post your question once in a single forum - it is against rules to post in multiple places.
I have deleted you post in the Functional Requirements forum.
Based on what you are suggesting that you keep - it looks like you have captured the main items and it will be fairly simple to maintain. One thing that you might want to consider adding is a column which describes the impact to the testing group. Depending on when the downtime is and how long it may have a different impact.
I have not failed. I've just found 10,000 ways that won't work" --Thomas Edison