In the current build of the game (1.1.5) you cannot Reverse Engineer gear to the point of becoming an Orange/Custom piece, it will always go from Green>Blue>Purple. There are some exceptions where a green can lead to a few types of blues which then lead to a few types of purples, but yeah never orange. The only way to craft orange equipment is to either learn an orange schematic from your trainer or learn it from a loot dropped schematic.
Starting in Game Update 1.2 they will be adding more schematics and also Orange Crafted gear will gain an Augment slot when critically crafted, make orange custom gear the potential BiS gear.
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