My friend trevorpbrennan thought of this add-on thing, and I like it (Most of my ideas come from him :P)! The concept is that you have a basic creation, and you can add these add-on's to make more things happen... and stuff. I made a list of things I plan to add:

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For Nukes:
-Patches Add-On (Fixes major bugs.) ✔
-Crafting Recipe (Adds a crafting recipe.) ✔
-Bigger Explosion (Bigger mushroom cloud.)
-Nucular Waste (Spreads lava around the explosion)
-Better Explosion (Bigger explosion, and fireworks to simulate explosions)

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Anyways, on to the add-on. This fixes a huge bug! If the tnt couldn't fall onto the point where you spawned the nuke, the warning display stays forever... That's obviously not desirable. This fixes that. If the nuke can't find the tnt in 10 seconds, it disarms it. I would recomend updating immediately! If you can't be bothered to do that, type /kill @e[type=ArmorStand,score_nuke_min=1] to kill the nuke head. Get the command here!