I have a question in design a diy teensy. Teensy 3.2 mainly based on MK20. And the pre-loaded bootloader chip make it possible for teesny to load arduino code. So if a want to design a teensy based boad. I can just make two board. One is pre-loaded bootloader board with a small bootloader chip and Micro usb on it. The other have MK20 and the left.Is that right? Do you have any suggestion if the bootloader chip must be attached to the main board anytime? It is impoartant for me,because I want to design a very small board. I have made a project based on teensy3.2 , so I don't want to change a lot. Anyone has some experence ? Thank you.