the boyz are better off as shootas and in squads of 30/21/21
imo
the nobs in the trukk will get shot down from asap unless you manage to hide them and use them like the cleanupcrew, since a lone trukk sticks out in the eyes of the enemy (when shot down they will have to footslog and this will be an issue for you =/)
dont forget to get a painboy, powerclaw or two, and a couple of kobiskorchas, the rest with big choppas in the nobs squad. its a big point dump but the nobs are a deathstar squad in all forms
I just wish they had a better way of transportation (bikes or battlewagon)
the deffkoptas dont really need the bommz since they are a skirmish tankhunting unit. You should run them in small squads of 1-2 (if they get shot at they break so easy)
but they are awesome
the warbuggies as far as i know are not too good, but can be fun i guess
I dont even know what a Flakkadakka truk is

i'm guessing its a
FW model
Hope my thoughts so far will help you