I keep the 4-system limit and company sizing, as well as station rules, in all games.
I don't play with the doomsday clock, as it seems a little weird. Most of my games end up at 5-6 full rounds, and then it goes really quickly with reduced frame numbers. Total rounds are about 9-11.
Usually, I count terrain as the standard 3-brick-high ruling, but some pieces I have don't count. I also use a terrain called Energy Shielding, which, if destroyed, comes back in-between rounds. However, a single hit destroys it.
A single unit of measurement is about 5 studs. Movement is determined by a single D6, with frames moving up to that many units, but at least one. Ranges are as follows:



Attack dice are one d6 per barrel, with every other one becoming a d8 instead. Limits can vary, but the overall cap is six (and this is only with an added hindrance).
Defense dice are one automatic, plus one for each

Win conditions are to be the last one left standing or to capture all stations. This second condition means each team needs three stations.
The most-changed thing is




SSRs are global, and do not need a specifc carrier. They deal a

Turn order is decided by a dice roll, with the lowest number being first. Each player starts with the same amount of points: 1 for each frame, plus 1 for each station. Players should have matching frame counts. Turn order after round 1 is based off of points. When there is no change, turn order remains the same.
In a round, each frame can be activated only once. A dead frame takes no actions, and it is skipped.
Cover is omni-directional and is not based on line of sight, but proximity. Being within 1 unit of cover considers a frame protected. Defense rolls from a protected frame affect the cover, not the frame. (Example: A Chub is protected and rolls a six for defense. Then, it moves away from its cover and is attacked. The Chub rolls defense again, and gets a two. The two is the value you would apply to this combat.)
I hope you enjoyed, and these rules are quite balanced and well-tested. If there are any questions, please ask or improvise.