Is your goal a project or trying to make a very small board?
All my projects have been to make something I could not purchase, or with features that were unavailable in offered boards.
My current board is a SD card + RTC + battery + plugin for 1.3" OLED. All the eBay, Adafruit, spark fun SD boards have a Chip select flaw that allows only one SPI on the bus. My board fixes that.
Clearly your projects are your own, I'm just suggesting a different point of view.
John