Threadomancy!
I've been working on simplifying some of these rules and will put together a PDF at some point. The overall idea is that each item is simple enough to put the complete rules and profile on a small card.
Mega MinefieldsInfantry: Very Dangerous*
Vehicles: Very Dangerous*
War Engines: Very Dangerous*
Applies to Skimmers and Jump Troops.
Super RazorwireIs Open terrain during an Advance, Marshall or Engage order. Is Impassible terrain during all other movement. Can be ignored by Skimmers, Jump Troops and War Engines.
Notes - the idea is to make razorwire something that slows units down but doesn't damage them.
Pillboxes
Small pillboxes fight as part of any formation that they're in coherency with, but can only be part of one formation at a time. If all friendly formations move away, enemy formations can use them. They will be destroyed if the formation they are part of loses an assault.
Type: AV
Speed: Immobile
Armour: 4+ Reinforced
CC: 6+
FF: 5+
Miscellaneous guns: 45cm AP5+/AT5+
Notes - as simple as possible, hence the single gun type. There may be quite a lot of these on the table so it helps if they're all the same.
Very Dangerous TerrainAs Dangerous Terrain but units are hit on a 1-3 instead of a 1. Cautious Movement and the Walker ability still allow re-rolls. Armour saves can be taken against the hits but Void Shields, Power Fields and Holo-fields do not count.
Notes - Dangerous Terrain is mostly just an irritation rather than a deterrent, this makes it much nastier to low armour troops but unlikely to do much damage to heavy stuff.
Clearing Razorwire and MinefieldsWar Engines and Vindicators (and other vehicles as per scenario rules) can try to clear one 'section' of Razorwire or Minefield (10-15cm length) at the cost of a move. Roll for Very Dangerous Terrain but make a roll for each starting DC of the War Engine. Any roll of 4+ clears the section, every roll of 1-3 is a hit as per VDT. No re-rolls are allowed for Cautious Movement or Walker.
Any section under one or more barrage templates is treated as a single Infantry unit with 5+ armour. Any failed save clears the section.
Notes - any siege game should have ways of clearing the dangerous sections, but it's going to be risky for the units involved! 