Since when cybertech makes barrels? Armstech makes barels not cybertech. Cyber does only: Mods and armorings FOR BOTH FORCE AND NON FORCE USERS

yes cybertech can make make blue and purple reusable granades

No, you get 3 crew skills of your choice where 1 is crafting and 2 is geathering, you can do 3 geathering if you wish so but no more then 1 crafting skill. Your companions will work for you and craft itmes or do crew skill missions each companion has slight bonuses to some crew skills ) except an on board droid - he is a tool.

means if you craft blue or green quality item it has a better chance to be crafted as an "exceptional" item that item will have a random enhancement slot, pretty much if you put an enhancement in this will make that gear equivalent ( by base stats) to a gear that is 1 tire above for example if you get upgradeable green after upgrading it will become equivalent of blue quality, upgradeable blue will become equivalent to purple of the same lvl and so on. Do not confuse with orange gear, the blue gear will not have its damage or armor stat upgraded upon putting in enhancements if there is a slot all that will happen is a raw stat boost.

The purple grenades are unlimited and some of them do more damage then best of your CD-es for example an incendiary grenade does 2k damage on impact +2k DoT for 12 secs, very nice adage in pvp in open world or, on that tough mob you have problem downing