Took me a little while, but I finally got the next block of this done :)
I nearly finished it last night, but I made the mistake of working on it longer than I should have - ended up just getting tired and frustrated and eventually sewed a segment of it the wrong way round. Left it for the night and came back to it this evening - what a difference! Everything suddenly was measuring correctly and I fixed the mistake I made the night before.
Still need to do the final square-up for it, but I'll do that tomorrow.