Ladies and Gentleman, boys and girls, and small english language reading Chimpanzees everywhere; in the last week I've received three PMs and three emails about these doors. Unfortunately I'm not a partipant in any ongoing acquisition here.
Darrel is on a vacation trip right now so any definitive answer as to if there will be production and when it will occur won't get answered until he gets back. Also, if he does produce he's a vendor himself. So it is unlikely that any coordination and last leg shipping of a bulk order would have to be taken on by any one of you. You'd just pay Darrel and he'd send them to you.
For what it's worth, I'd not been following this thread but did look at it today after the recent emails and PMs. It seems that no one really knows how many and of which years everyone wants and how committed the "I want ones" really are. Someone who is participating here should take the reins, start a thread titled specifically for the topic Locking Doors for the Lowers (or something like that) and make the first post there a description of what you want to buy and a request for commitments to buy. Then list the names and the numbers for each year model following that.
Only then will you have good quantitative information to provide to the vendor and only then will he be able to decide if production will occur.