I'm glad you guys liked it.
To answer the questions, the knights were very effective in the game. They mostly fought each other but they are not something that you can ignore, even with a warlord, maybe especially with a warlord.
If the knights get in close they ignore void shields, you can't hit them with carapace weapons, they can do damage to you, smash attacks are not super effective, firing volcano cannons at point blank range can do as much damage to you as to them and they not only can damage you with their shooting but also with their close combat attacks.
It is incredible how much everything works like the way you would imagine it is supposed to work.
In the next game I will have some knight lancers which we are going to treat as knights with one lower armour value across the board and moving 2" faster.
As far as the titans go, the Warlord is 5" to its carapace and the Reaver is 3 3/8 in to its carapace. Of course it will depend a little bit on how much you bend the legs. Not as much wiggle room with the Warlords as the Reavers