I'd say the pricing and items look fundamentally good, and those 2 BBs will support your 24v Multi just fine (though for how long obviously depends on your loads), so no problems there. Personally I'd like to see a BEP battery switch in there so that you can physically disconnect your Multi from the battery bank if necessary, without getting in there and undoing lugs. I'd also recommend at least one NEG bus to connect to the "loads and chargers" side of your BMV shunt; the bolt that comes on these isn't terribly long, so if you have more than a couple load/charger/chassis NEGs to connect to it, a busbar comes in super handy.
...I don't see a 24 to 12 converter in there anywhere, which you'll need to be able to power your standard 12v loads; likewise for their BIM, I'm assuming that your start batt is 12v and you're evidently planning a 24v aux bank, so that BIM isn't going to do you much good without a 12-24 converter on the end of it. This sort of thing is why we rarely recommend a 24v system in a 12v native chassis, because you end up spending enough in up- and down-conversion to usable voltage that the savings are usually pretty minimal. That being said, the 12v Multi would definitely need a 3rd BB100 to power it, so... in the end, even after the converters, you'll still save a bit.
The last particular thing I see missing is whether or not they're going to program the Multi for you before they ship it; if not, you'll need to add the cost of an MK3 to USB Adapter to the price, which is what you need to interface with the Multi through your laptop to get it programmed. It's not bad, they run about $68.83 each, but it's an item to consider. BB is generally pretty great to work with, though, they'll likely program it for you... just make sure to mention it.
