I wrote 8 pages before I realized I was simply playing by the Watchtower's stupid rules. More importantly, I was making life easier for them since all they would have to do is say "C.A. is no longer one of Jehovah's Witnesses" and then have the closing prayer.
Write the letter if you must, but I can guarantee that it will not be read in its entirety. This is because the JW mind is trained to immediately shut down at the slightest hint of criticism towards the Corporation. Just saying, your efforts will likely be in vain...