This frame was designed for 1806 motors and 3" props.  The FC pattern is 20mm x 20mm.

Split level design, intended to be light and agile.  Recommended parts include AIO F4 FC, runcam split V2, your choice of receiver and VTX, 30mm standoffs allow for a 3 board stack.  Although seen in the pictures the design was not intended to carry an action camera, but could if desired.  A battery protector plate is included if you desire to carry the battery on the bottom.

This frame was designed for use with 3 inch propeller, all in one ESC, FC and Vtx.  Frame is a stretched X design, measurements between front two motors 90mm, from front to back motor 125mm, from back left to right front 154mm.  Motor mounting holes are for 12mm diameter layout with 4 - M2 screw holes such as on the Emax 1306 motors.  This frame was designed to have the mini camera and Frsky R-XSR installed on top as shown in the photos with a 3d printed mount.  Below is the link for a 3d printed mount that was specifically designed for this purpose.

https://www.thingiverse.com/thing:2799602