Please help me build a list for a huge 5-player match!

First off I have never really used Reddit before so I apologize if I accidently break a rule or formality when posting this

Hello everyone! In a few months me and some friends are going to be running a huge game of 40k. 2000 Point 5-player Free for all Take and Hold. I am having a lot of trouble coming up with a good list for this match as I have a lot of things to account for with a total lack of experience. I need some help putting together a good list for the match, detachment and all.

Armies I am facing: Space Wolves, Red Corsairs, Tyranids and Druhkari

Models I own:

CHARACTERS:
Painboy, Mek, Warboss (x2), Painboss, Ghaz, Snikrot, Mozrog, Wartsnagga, Beastboss (x2),

INFANTRY:
Boyz (x4), Beast Snagga Boyz (x4), Gretchin (x3), Nobz (x2), Wrecka Crew, Kommandos, Flashgitz, Storm Boyz, Flamethrowers, MegaNobz

VEHICHLES/MOUNTED:
Trukk (x2), Snazzwagon, Scrapjet, Wazbom Blastajet, Warbikers (x2), Squighog Boyz (x2), Deffkoptas, KillaKans, Deffdread, Stompa, Mek Guns (x3), Killrig, Gorkanaut

Obviously with such a large game one of my concerns is being able to actually last on the board, as this match will definitely go on for atleast 2 days. I need a list that lasts and helps me get objectives done!