Work in progress!
This VFO will be based on a Si5351A oscillator, controlled by an Arduino Nano. It is rotary encoder controlled and displayes the information on a SSD1306 OLED display. It is a modification of the design by CesarSound here: https://projecthub.arduino.cc/CesarSound/acdc2564-95dd-40c6-8cfd-347833b73ffa
I used EasyEDA to make the schematic and PCB Gerber files.