my thought is to drop down to only two deffkoptas with
TL Rokkits as seperate units, and I'd bring bring 2x 20 shoota boyz squads (probably would skip over giving the nobs claws since you wont have the points to) , and then swap the mega armor warboss with something bonkers like a weirdboy or old zog as orkimedezz said or even a
SAG Big Mek
Maybe then finish of the list with some killakans or Stormboyz or Komandos or whatnot
the warboss in mega armor is reaaally out of place here, since the squad he is attached to wont be able to run and stuff, a Mega armored warboss has a tendency to hand with mega armored nobz in some sort of transport, mostly Battlewagons, but i have seen them riding a trukk and doing just fine
if it was a competetive list i'd say get a
KFF Big Mek and all the boyz in the world, but for funzies you cant go wrong with a weirdboy or a
SAG Big Mek
Again rule No1 for playing orks is you can never go wrong with bringing more boyz