Hi there
Indeed… 
More I/O . The PITA was finding the B2B but it’s all there, anyone can order it from the PCB house or have them made. the BOM is on the Link or in the file. Jump on Easy EDA or JLPCB and use the part number that’s listed to look it up. Seeed should make an IMU version with the SD. or a Multi-Sensor snap on B2B ish board. 
HTH
GL 
PJ 