So, I have this idea for a semi competitive but mostly fun Ork Freebootaz list;
Kaptin Badrukk - decent gun hits on 4's and Flash gitz (including him) reroll 1's to hit
Big Mek with telly porta gun - maybe shoots some stuff but mostly keeps the Morkanaut running.
10 boyz 1 with a rocket and a Nob with a rocket and klaw - go around and claim objectives and maybe blow stuff up too
10 boyz 1 with a rocket and a Nob with a rocket and klaw - same as above
2 units of 10 gretchen - sorta cheap way to get more wounds for the flash gitz and they might accidentally do something else useful too
10 Tankbustas in a Trukk - Blowin stuff up. If competitive streak goes off they can hit on 4 + and reroll to hit vehicles!
5 Flash Gitz - Maybe in a trukk maybe not IDK. this small unit can try to take out a small target and trigger a competitive streak in the rest of the army
10 Flash Gitz - if they're 'competitive' the kaptin hits on a 2 and rerolls 1's if he's next to Badrukk. the rest hit on 3's
Morkanaut with 'Sparkly bits' and a kustom shield - hits on a 4+ (3+ if his competitive streak goes off)
I think that's about all. It's not very much but if the flash gitz and Morkanaut get a chance, they can do some real damage. The grot shields and kustom shield should help keep the Gitz alive.