The Teensy 3.6 has two pairs of pins that can be used for CAN0: 3 & 4 or 29 & 30. The default is 3 & 4, but this adapter connects to the alternate pins 29 and 30. If you use the collin80/FlexCAN library, you have to set the alternate pins when you initialize the bus.
The shipping took a while but when it arrived I was impressed and pleased.
The notes say you have to remove the SDCard when programming but in practise I found this wasn't necessary.
The expansion connector is interesting and if it exposes an I2C interface or a UART I'd suggest adding a U-Blox SAM-M8Q daughter board as this would allow the construction of a very small CAN logger with GPS. Failing that, a battery backed RTC would be useful to add a timestamp to the logs.
Hi! Header soldering is fairly simple, just line up with the bottom of the Teensy and solder in place (illustrations available on product page. I have considered a jumper for the resistor, but space is very confined and most customers prefer to have the 120Ohm resistors soldered in place.