[quote... ]can I still fit a Sense HAT on the top?[/quote]
Nope, not without using a stacking header from here: https://www.adafruit.com/product/1979
You may have to get a couple and stack them to clear the fan. Remember to use longer standoffs to secure the sensor hat to the RPi board.
Retired IT professional, C programmer and "beardie weirdie".
RPi interests: Developing an Infinite Improbability Drive
“Thinking outside of the box allows you to get rewards outside of your reach.” Matshona Dhliwayo