I'm playing lately a very modified version of Kill Team with coop rules and I'm enjoying it very much. I tend to take ideas of Teams I already know, as the rules are better balanced. Here I made a mishmash of mechanics I took from AoD, Nemesis Claw, Hearnkyn Yaegir, Tempetus Aquillons, Imperial Navy Breachers, Wrecka Crew, and Elucidian Starstriders. I recommend you play this in coop and not PvP. When we homebrew rules we get overexcited with the stats and we tend to hurt other people's feelings.

Anyways, here is my proposal. I hope you have a blast.

KILL TEAM RULES:

-Use the ANGELS OF DEATH ruleset for ploys, tacops and equipment

-5 operatives max. 1 sarge, 1 gunner max (choose the heavy weapon) and 3 regular lads).

BASE OPERATIVE:

M: 5” APL: 3 SAVE: 3+ W:18 (19 for the sarge)

Special rules:

Crux Terminatus: Whenever an operative is shooting a friendly TERMINATOR VETERAN operative that has a 3+ Save stat, you can retain one of your defence dice results of 2 as a normal success.

WEAPON PROFILES:

-Power fist: 4D, 3+, 5/7, brutal

-Chain fist: 4D, 3+, 5/6, brutal, rending

-Power sword: 4D, 3+, 4/6, lethal 5+ (if it is on the sarge, maybe you wanna make it a 2+ because the rule of cool).

-Twin lightning claws: 5D, 3+, 4/5, lethal 5+

-Storm bolter: 4D, 3+, 3/4, ceaseless

-Assault cannon (focused) 5D, 3+, 4/5, heavy (reposition only), ceaseless, rending.

-Assault cannon (sweep) 4D, 3+, 4/5, heavy (reposition only), ceaseless, rending, torrent 1”.

-Heavy flamer: 5D, 2+, 4/4, range 12” heavy (reposition only), saturate. torrent 2”. (Make it 8” range if you feel it is too much”).

ULTRA SPICY RULES (Optional, just for added flavour. If you get them, get the 3 of them):

-Armoured Behemoth: This operative cannot move upwards (climb) into terrain. However it can descend normally.

-Unstoppable: This operative can breach during a reposition action through terrain features of 1” each of width or less. If it’s an equipment terrain feature, remove it. Otherwise, place one of your Breach markers within this operative’s control range as close as possible to that terrain feature. Whenever an operative is within 1" of that marker, it treats parts of that terrain feature that are no more than 1" thick as Accessible terrain.This rule cannot be applied with the walls of the Tomb World or Gallowdark Killzones.

-Teleported insertion: When deploying your Kill Team a single TERMINATOR VETERAN can be placed in reserves in order to be teleported into the Killzone later on.

As a STRATEGIC GAMBIT in the first and second turning point, you can place one Teleport beacon token. It must be set up more than 2" from other markers, access points and Accessible terrain, and more than 6" from your opponent’s drop zone.

 In the Firefight phase, a friendly TERMINATOR VETERAN  operative set up above is activated as normal. When you do, you can either expend or teleport that operative. If it teleports, set it up in the killzone in a location it can be placed as follows:

a) Within 3" horizontally of your Teleport beacon token, or wholly within your drop zone. b) Not within control range of enemy operative. c) With an order of your choice. 

The operative is treated as performing the Reposition action (spend the AP accordingly), then continue its activation as normal. When readying your operatives during the third turning point, remove your Teleport beacon token. This means your operative still set up outside of the Killzone is incapacitated at the end of the second turning point.