My general thinking is that the nuclear weapons will:
cost 20 ipcs to build
cost 5 ipcs/turn in upkeep to keep nukes at the ready
the nukes that you don’t pay the upkeep for are mothballed. To get them ready for use you must pay an additional 5 ipcs (on top of the 5 ipcs in upkeep). The upkeep payment is made by everyone at the same time during a brief nuke upkeep phase between rounds (ie after player 8 has finished their turn but before player 1 takes their next turn).
When conducting a nuclear strike you may choose to launch a strategic or a tactical attack. Each such attack costs one nuke
STRATEGIC - Nukes are used against industrial complexes, naval bases, or airfields. This works as a normal strategic bombings except you roll additional dice, do not add +2 to the damage, and there is no limit to the damage that a nuclear strike can do to a facility. So an atomic bomb could theoretically do 20 levels of damage to an industrial complex in a single turn- effectively crippling it for the rest of the game.
Abomb - roll 4 dice. The sum total of the rolls is the damage inflicted to a facility.
Hydrogen Bomb - roll 8 dice. The sum total of the rolls is the damage inflicted to a facility.
Tsar bomb- roll 12 dice. The sum total of the rolls is the damage inflicted to a facility.
TACTICAL - tactical strikes target the ground forces in a territory. When launching a tactical attack against a territory roll 1 dice for every enemy unit in the territory. If the attacked area is also being assaulted by your land forces then the tactical nukes are launched before the first cycle of combat takes place. You may use multiple nukes to launch multiple tactical nuclear strikes against the same territory. If a player used 2 nukes to attack a territory then he would roll 2 dice per every enemy unit in the territory, etc.
Abomb - rolls of 1 kill an enemy unit.
Hydrogen bomb - rolls of 2 or less kill an enemy unit.
Tsar Bomb - rolls of 3 or less kill an enemy unit.
Units killed in such strikes are immediately removed from the board and may not retaliate against their attacker.
Only strategic bombers or icbms may carry nukes. Strategic bombers used to launch tactical nukes may only be targeted by enemy aa and may not take part in any additional combats that take part in the territory they just nuked.
The other techs look pretty good so far with only the one tank destroyers tech really needing revision.