The intarsia joins look all right, but I hope (and expect) they will look even better after blocking. Long way to go before I'm there, though.
Variation makes this a nice sweater to knit: three different colours make the squares interesting to make, and after making six big squares it's time for mitred horizontal stripes.
In the original design there are three white stripes against a dark background, but I've decided to make two with a rusty cold carrot stripe betwen them instead. Next time I'll post a picture of the right side.
I'm telling myself to see all the ends to weave in as a form of variation too.