After, checking the schematic against datasheets and other people's schematics, I have tweaked a few connections (or added missing ones) and now the basic schematic is ready (see attached image). The top left sensor is the BMP388 (pressure), the top right one is BNO055 (Absolute Orientation) and the bottom one is the SHT35-D (temperature and humidity). 

Please note these schematic are not the final version. I need to at least add shared I2C connections. Also, I will add a voltage regulator, logic level converters, reset buttons and MOSFETs. 

Edit - I noticed I forgot to connect the VSS pin to ground on the SHT35-DIS-B. This will be fixed in the next schematic I release.