Well, i see no exploit in the item not being completed. This because of 4 points:

1- The dude will be burning a leve allowance per leve.
2- The player won't receive the crafted item until someone actually complete it.
3- It might be following the local leve rules...a dodore doublet is said to be a r47 recipe (so would be at r45 leves) do only 40+ LTW would actually have access to this leve.
4- Leve results cannot HQ.

I do find this an extremely good idea. And if this worked, the next step would be farming leves, where you ask a certain amount of raw items obtained thru gathering or from common monsters and the dude receive a gil reward plus a leve xp bonus in the end.

IMO leves were an awesome idea in every single aspect if you look to them as interplayer business...just like the MW simulates a NPC vendor for interplayer deals, leves can easily do it to simulate quests for the same purpose.