A search for "Dual Deploy Design" turns up 10 threads. Be a little creative in the search string and you can find a lot of stuff related to almost any topic here (in this case, perhaps "altimeter bay" or something like that)! edwardw put up an excellent dual-deploy pictorial for his L1/L2 project in the Support and Recovery forum at https://www.rocketryforum.com/showthread.php?s=&threadid=8498 .