I've been playing with the curved seams a bit more and ended up with this block.
I like it but it is a bit slow and fiddly to do the curved seams. A couple of the joins aren't great but its okay for a first attempt. It might have been easier if I had done the 1/4 circle blocks bigger, trying to get it through the machine is tight.
I got some Marti Mitchell drunkards path templates, I love these as they are so sturdy but I have a large rotary cutter and it was a bit hard to cut. I think they would be easier using the smaller cutters, something else to add to the shopping list.