On the other hand, you look at the fiction out there and you see that (in some) creating a magic item was difficult to the point of threatening life...as were some spells.
Tom Baker as the evil sorcerer in one of the Sinbad movies aged every time he tried something difficult...Odin sacrificed an eye for a share of ultimate wisdom...
Creating magic items should NOT be easy. You don't want your campaign flooded with custom magic.
Perhaps the rule should just be this: Each magic item has material components that must be supplied/obtained by either the artificer or his client- personally- and STICK to it. If something requires "the sound of falling snow" then can't be made until winter, or must be made in the mountains, or within the Arctic/Antarctic circle... And if it takes 180 days to make, then it takes 180 days to make. If the artificer is an NPC, make the players wait. If its a PC, that character can't go anywhere "fun" for a while- and his player may need to play a different PC for a while.
In other words- it should require a quest- however minor.