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Big Mek w/ SAG
60 Shoota Boyz
30 slugga choppa Boyz
Big mek's deffdred dred w/ 2x scorcha's and 2x CCW
2 defcopta's w/ twin linked big Shoota
9 ork Kannons w/ 9 ammo runts

If you can swap the choppa boyz for shootas you won't regret it.

A KFF Mek is better than a SAG mek in this case (and most of the time)

Deff Dreads are literally like taking a points handicap. They're incredibly useless.

With so few Koptas I'd recommend using the rokkits. Make sure you split them into solo units.

Aside from the Koptas part, which you should do regardless, all that advice is assuming you want maximum competitiveness. If your not playing like that, I'd still honestly drop the dread. They're just so incredibly disappointing

Dakkamite is right, the SAG Mek sounds cool on paper, but the KFF Mek will probably be more useful to your footslogging Boyz. Saving 33% of your wounds is nothing to sneeze at. If you have the models, maybe drop the Dread and bring more Deffkoptas. They have so many uses (Outflank, Hammer of Wrath, not to mention Linebreaker). And yes, give them TL-rokkits. Twin-linked weapons help Orks a lot from what I've seen.

Take any unit you want Orks are a tier 32 list. I know there in not 32 different codexes in 40k but i have to include standard Alllied teams like jedi/sith Eldar, TauDar
1) The KFF BigMek looks great on paper, but between TauDar, focus fire, TLOS & Precision Shots. He will last about 1 turn.
2) The 9 Kannons w/ 9 ammo runts are great but you need to add all the crew/mek/slaver. As there toughness 7 grots with a 3+ save, so it works like a T7 W14 MC with 5 gun
3) Lootas they are the only good unit in the codex & your only
AA so.... take 45