Yes, column stagger is amazing! Congrats on the prototype! I ended up using mine a bit over a month before getting a nicer, revised version cut. I learned from that. Removed some keys, moved some a bit.
I’ve read elsewhere that switching to a new layout is easier at the same time as changing to ergo, instead of later. I’ve had some time off, that’s why I did it now. If I had been busy, I’d rather have started using my new board and the old layout.