You need to make an original item and then two upgrade components (a normal one and then a greater one). The gating materials on this total out to be 450 Truesteel Ingots and 30 Savage Blood. If we assume that we are fully funding our character's Truesteel Ingot CD @ skill 700 as well as our building work orders we'd be generating 16 per day + and initial burst of 20 from the CD's stored charges. This is 27 days worth of CDs. I understand that the profession boosting follower will increase the yield of work orders but I don't know the exact value. For some reason I have double production either 50% (19 total) or 100% (22 total) of the time. In those cases it would be 23 or 20 days respectively. The bloods will most likely not be a gating factor depending on their drop rate from the Barn work orders but the only comment I found on it was 1 per even with a booster so 6 per day for a total of 5 days.Have you done or have you seen a reasonable estimate of how long it will before we are able to produce our first piece of crafted gear? (Particularly with the associated profession and garrison building, but I guess without the profession as well) Wowhead's profession guide has the 640s costing 100 of the BoP crafting material and the 655 upgrade costing another 150 plus 15 of what I assume is the Barn produced material. (Savage Blood)
From our raid schedule we'll only have had an opportunity to clear Heroic Highmaul 2x by day 27 and depending on how long it took you to get your production into full swing you'll have made at least 1 crafted item by this point. Heroic Highmaul gear is comparable in ilevel to the crafted stuff (670 from the raid 665 from the crafted armor) so depending on the piece it will likely stay relevant as long as we don't get overloaded with pieces in the same slot for the plate users. I'd recommend researching a piece that has a less common copy occurrence, a slot with absolutely terrible secondary stat options (because these can be rerolled on crafted gear), or a slot that drops later in mythic to avoid immediate replacement.
Wowhead's default loot list for the whole zone is bullshit - there will be gear for all slots according to the in-game dungeon journal.
If you have a non-blacksmith alt with a blacksmith building they can produce the base item in tandem to shave time off. Only a profession character can make the upgrade pieces.