Which projects do you expect after completing DG for the first time? I can't remember any projects being unlocked by finishing DH (unlike IH where you unlock the projects for the FI and FB blueprints and eventually the Regulus).
And the blueprints you can obtain by playing the DH raid are random boss drops. So once a week (per character) each boss has a chance to drop raid-specific loot – such as the EB, mats and blueprints for the formerly raid-exclusive Gear Sets. So you'll just have to rinse and repeat.