The key to cutting out straight-grained workpieces is in the layout. I laid out the parts to follow the grain. (I laid them out just a little oversized so I could mill them to final size later.)
The first cut on the board has to be done freehand. There’s no straight, parallel edge that matches my layout lines, so I couldn’t use a rip fence. Instead, cut close to the waste side of the line and concentrate on making a straight cut. This way, there will be less cleanup to do later.