I would just like to add to your guide, https://testmy.net/topic-1013
I have developed a calculator with Mnosteele and Dannjr from DSLNuts [i am a mod there], that you can use for any speed, the general CCS files are convienent, but this is really a better way for you to get your settings, since you can input a different MTU and up/download speeds. It will also generate the CCS file directly for you to download which you can then input into Cablenut.
Calculator for XP/2k: http://www.j79zlr.com/cablenutXP2k.php
Calculator for ME/98: http://www.j79zlr.com/cablenutME98.php