Work in progress

It's less than a month to Christmas Day and I'm already late with my presents. Thankfully I have had a moment of cleverness and planned only one self made present: a quilt for my grandparents.
Here is a photo of my work in progress:

It will be a bowtie quilt and right now this is my favourite layout. There are still a few blocks to sew to make it a nice size. I'm not quite sure how to proceed though.
Should I sew rows or should I first sew x and o blocks and than sew into rows?
Moreover I have to think of a quilting design. I could do an allover meandering design, but I was thinking to try something new this time. First of all I hope it makes the quilt more special and second I think the orange turned out to be less subdued than expected. So I was thinking to quilt the orange parts in a dense pattern and only to outline the other parts to make them pop out more.
Let's see.