It is impossible to make any dragon item or weapon with smithing except the dragon platebody and the dragon sq shield, and even that is combining rare drops to make the item.
The only way to obain a dragon full helm is to either buy one in the grand exchange for a lot of money. Or kill Mithril Dragons which is a level 304 monster in the barbarian dungeon. It is a very rare drop.
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You can make these yourself providing you have the materials and crafting level, otherwise you can do level 3 clues to get black dragon-hide pieces or you can just buy the set off another player or at the Grand Exchange.
You can't make Dragon armour set, only the platebody and you need to do a quest plus have all 3 different parts to it along with 90 odd smithing. The parts alone are like 8m odd.
No monster currently drops an entire dragon plate body.The three pieces of it are dropped by tormented beast's,the three pieces can be fixed together to make the dragon plate body with 92 smithing and a blast fusion hammer(1,100,000 gp). A player smithing the parts and selling the armor would make a profit of about 1,000,000 gp.
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