I'd love to see a multiple-stage leve, further incorporating DoL too, options could be like:
Player places a request for an item with a choice to:
1) Provide ingredients themselves and go straight to a "Crafting" status
2) Buy ingredients direct from MW at lowest price available (subject to item availability) and again be at "Crafting" status
3) Place the leve in "Gathering" status for DoL/H to provide materials against
The leve displays a recipe list of ingredients required. Disciples of Land/Hand can trade any of these items against this leve and receive reward proportionate to value of item/s (synced with Item Search Counter Sales History). First person to trade gets reward. When all materials have been gathered, the leve progresses to the "Crafting" stage. Crafters have all of the timers etc mentioned by other posters to complete leve.
Items SHOULD be destructible and items only craftable by DoH within 5 or so Levels of recipe.
The Crafter should also have to "buy" the material when they accept the Leve (With a bit shaved off the going rate in ISC History). If the Leve is successful, the money is refunded and the Crafter is rewarded. If the Leve is failed, the crafter loses money based on which items are lost (not all should be lost, with remaining item value refunded, and items returned to Leve's stock).
The Leve returns to "Gathering" stage, with another Adventurer Leve allocation (provide material for *this* leve and be allowed to provide for another) being offered as an addition to gil, creating further incentive for a failed Leve to receive more widespread attention while still removing items and gil from the economy and not giving a 100% success rate. HQ should be possible, with the crafter being rewarded for their efforts by the server (Marks, GC Seals, Allocation or w/e) and not the Leve-owner.
If "Gathering" is unsuccessful after a certain period of time, Leve-owner is contacted to either continue to seek gathered materials or change the format of leve and purchase items etc.
I'm sure people could find ways to exploit the system. In the same respect, there will be ways to combat it and ever heard that cheaters never prosper? This is a genuinely wonderful idea to bring interactivity back into this game. The market wards are a ghost town. Retainers are lifeless NPC's...if we could shift certain aspects of the way that goods and services are handled and exchanged, we can reduce the number of retainers in the wards and give players something to leave for log off time or manage from their Android/Smartphone in future. It also allows someone an instant sell option if an item they've gathered is currently required by an Adventurer Leve...much better than waiting for someone to need it and find it in the MW.
I might also add that both PC names should be Anonymous if requested and Anonymous until completed if not requested.