Alright, so another user asked me to help him make a competitive Kan Wall type army, but since it's not my area of expertise, I'm posting up my attempt for C&C by the dakka community
This list is Codex: Dread Mob from Forgeworld allied to Codex: Orks. Before anyone asks, yes this is 100% legal, its no different than allying Blood Angels and Space Marines.
HQ
Big Mek w/ SAG, Bosspole, Cybork, Ammo Runt x2
[Allied] Big Mek w/ KFF, Bosspole, Cybork, Burna
Troops
20x Spanna Boys w/ Shoota, Mek w/ Burna
3x Deff Dread w/ Double Skorchas
[Allied] 30x Shoota Boys w/ 3x Big Shoota
[Allied] 12x Gretchin, Runtherd
Fast Attack
15x Killa Kan w/ Grotzooka
Heavy Support
[Allied] Big Guns w/ Lobba, 3x Ammo Runt, 6x Extra Crew, Runtherd
Fortifications
Aegis Wall w/ Lascannon
The force is divided into a massive charging horde of walkers and boys, and then the Grots and
SAG Meks who hold the back line and bomb things.
The Boys and Walkers pretty much just surge forward, protected by the forcefield, and stomp face. I'm counting on sheer weight of numbers of Kans to drop a crapload of small blasts and then wreck vehicles up close, while the Boys just do what boys do best - die in huge numbers, snag objectives, and dakka wat needs dakka'ing.
Aegis wraps around the backfield objective if possible, and if not, is positioned very close to it. The Grots hunker down on the Objective, and claim perfect concealment from the Aegis making them invulnerable to most shooting. Extra Crew from the Lobbas man the Lascannon, and the Ammo runts from that unit are used as necessary for the
SAG Meks, Lobbas and the Lascannon. Meanwhile the
SAG Meks join the Lobba unit and use the Grots and Guns as shields.