All schemas and PCB (gerber), can be downloaded on the VinyGo git project. https://github.com/Mras2an/VinyGo/tree/master/02_Hardware
The PCB does not have any particular constraint except to respect the "hardware design" proposed by Expressif to have the best radio performances. “make sure that the module is not covered by any metal shell. The antenna area of the module and the area 15 mm outside the antenna should be kept clean”.