The next Ork 8th edition list: Mobile firepower!

The rules as stated in 8th are not kind to MSU - the player that finishes placing first goes first.  This also applies to armies with many characters to throw out buffs.

So let's try an army with 4 drops. Yep. 4.

Spearhead Detachment x2 (Both identical)
HQ: Mek in Megarmor, kff

Heavy: Lootas x5
Heavy: Lootas x5
Heavy: Lootas x5

Heavy: battlewagon, no upgrades

Vanguard Detachment
HQ: Mek, kff, oiler
HQ: Mek, kff, oiler

Elites: 7 Tankbustas, nob
Elites: 7 Tankbustas, nob
Elite: 3 Meganobz

Heavy: battlewagon
Heavy: battlewagon, Deffrolla

So the idea should be pretty simple.  4 battlewagons, with T7 and 16 wounds and D3 wound repair a turn moving around and shooting a TON of shots out of them. The battlewagon's rules allow them to move and the lootas can fire without penalty.  Having multiple small units of lootas means you can fire each one before deciding how to the next, which is better than the split fire option they come with.

A few meganobz will be there to fend off anything that comes close.

I don't think it will do all that well..but it would be a heck of a lot of fun. I think a blend of this kind of shenanigans and infantry support would be a better way to go overall.