Grocket crash gamemode

Grocket crash gamemode: one barn with allot of open space a grocket crashes far away on the horizon about 1/3rd of the people are on grordborts side only automatically chosen for  pyro engineer and soldier they are automatically outfitted with grordbort weapons and items unable to change class or weapons (they do have a resupply cabinet) (and it is arena mode) ( they are given 1 minute to 

The other side has their class and weapon and items chosen automatically all weapons have a basic or homemade feel. sentries can only be upgraded to level 1 there is no resupply cabinet  the only pickups are 2 level 1 ammo and health pickups. There can be two soldiers , one heavy always with brass beast, no medics, one sniper with half ammo, 2 pyros , 1 demoman, 1 demo knight, 1 engineer , 1 spy, the rest scouts (no one can have the same item)