Yeah, this does sound like a good edition; As you said, this will help with the Mk:2 Jet-pack Bots. Not only should it make the Jet-pack slower, but it should also make your swings slower; also if you sky-draw with the bow while you have the armor, you should charge up the bow faster since you have the extra mass to pull the string back. I'm thinking the skin for the armor should resemble that of a Mk:3 Sword-Bot. And for the bosses, a nice orange glow surrounding them; and maybe for the bosses it would be like a Droideka shield, where if you were to go inside it, you can then damage the enemy, but from the outside.