Hey @ForumSn0w,
I don't have access to any 26650's myself, but, have assumed they are the same length as 18650, but 26mm in diameter?
That's great, thank you so much for taking the time to work on it and test fit. I will just order a couple of them from JLCPCB and see how everything fits. It might take a little bit before I can let you know how they turned out. Still need to source some springs and hardware. I think McMaster Carr might have what I need.