Turn 2:
My tunnelers tried to exit under freebooterz feets but the exit point deviates out of table. As my tunneler launchers can see the exit point, tunnelers are not destroyed but will stay underground one more turn.

Ork initiative and KOS buggys charge my trikes on my right flank and are in my deployment zone, my trikes on FF order snap fire few buggys engagins them, it works quite well. 2 squat bike detachment charge them. Nobz warbikes are placed to form a line outside the close combat. Praetorians advance but my behemoth is quite close to Bad moon boyz and few stands are in range to target it. I keep my last bike detachment in my deployment zone to be able to charge the mekboy renegade vehicles next turn if they decide to come at charge range. One the right, my overlord changes altitude to low and gains a cover behind a tower, SAG and Shootas won't be able to target it next turn but my overlord can shoot at warbike nobz.
First fire: quite all warbike nobz are killed by colossus and overlord. Deathskulls braincrushas are destroyed, lots of shootas are killed and only one stand left. bonecrushas in my half table is killed by warriors in ruins. It's still impossible to pass through the mekboy gargant shield and through dragsta renegade protection shield. SAG killed 2 thunderfire cannons. One more overlord is destroyed and one more Goliath cannon is removed. Behemoth lost few shields.
CC phase: the close combat involving KoS buggys vs Squat bikes turns in a success for the squats, few buggys survived:

Advance Fire: Liftas droppas are in luck and play with some bikes but the 3 rokkitz vehicles manage to roll 3 superb "misfire" in a row but avoid the destruction rolling nice armor saves.
End phase: Squats are leading but do not reach victory points, Kos is broken but moral check is OK, bad Moon clan is broken but moral check is OK too. Let go to turn 3
Turn 3:This Tunnelers could exit exactly where they were supposed to be. But a roll of 1 differ their exit to another turn.
Mekboy gargant do not turn off its shield.
Behemoth move backward (at half speed) to place more than 50cm between it and bad moons boyz. On my right flank, Kos survivors reengage CC against my victory bikers. Not that problematic for me. Renegades mekboyz charge to capture an objective in the center of the table. This time, my bike detachment that have not made anything during the table charge all the vehicles. One Bad Moon Nobz stand try to steal a squat objective hidding within 15cm of it behind a bridge. I move a colossus that can see it and that will be able to shot the renegades vehicles in the back if the protecting dragsta is killed in CC by my guildmaster on trike.
First Fire: I lost one more goliath, only 2 are remaining. But that's all. My praetorians trade their FF order to advance order, I want to be sure to destroy all renegades vehicles after CC.
CC: dragsta is killed! as well as few others mekboy vehicles. On my right flank, squat bikers win CC.
Advance Fire: Colossus shot sucessfully all vehicles not protected anymore by dragsta shield. Bad Moon Nobz stand is killed, it won't steal this objective! More Deathskull stands are killed.

End phase: Mekboy gargant is overcharged and generator explodes starting 3 fires and making explode the gargant!
I finally win 72 (4 obj) Vs 40 (3 obj), all orks clans are broken awarding a large victory, only boyz are still alive...
Conclusion:
A nice battle, a lot or good things, my opponent and me did not roll lucky dices. Finally, I respected my battle plan and this worked well as green wave was stopped by a wall of steel!