Update on where we are:
I've been disassembling Blue Gray boards, QCing parts, and then assembling them in the proper configuration and with good screws. As I've been reassembling the boards, I noticed some top and bottoms didn't match at all, despite on first glance all the boards did have good color matching. I've now realized that there seems to be 2 or 3 variants of this Blue Gray -- I assume because the anodizer can only anodize a certain number of items at once. Perfectly normal, but it's important I keep the top and bottoms matching as closely as possible. I've been backtracking and making sure all the pieces are paired together correctly. Here are a couple images showing this "problem":

In this image, you can see the colors aren't perfectly matched.

Swapping the tops around makes the colors the same.
I'm coming to the end of rematching everything, should be done tomorrow. Unfortunately this means nothing was sent in the past 7 days, however I'm now aiming to get some packages collected early next week.
I've been working on the premise that people would want their kit to be shipped very shortly after paying their shipping invoice, hence why many haven't received an invoice. However, if people overwhelming would prefer me to invoice everyone and wait for tracking, I'm happy to do that.
In Batch 4 news, production has now been confirmed, and is scheduled for 90 days starting on the 29th. This is the final batch, so it's great to see things coming to a close

Thanks for everyones patience once again.