Two 45 degree bends will have a negligible effect on low velocity airflow. I think that 10-1/4” gap between pipe sections is a much bigger deal.
Word to to the wise, if you paint a woodstove with rustoleum stove paint, burn it outside first. Damn thing nearly smoked us out.
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Looking good but I am curious how well the paint holds up. I have one very similar in my basement that needs something either paint or the stove black polish and couldn’t decide which and was scared the paint would keep burning off since it gets pretty hot on the outside if it gets a good fill of good wood.