You will need to print everything from https://www.printables.com/model/567043-btt-tft35-spi-v21-pivoting-display-mount except for the 3030/2020 mounts and the z covers. Follow printing instruction for that mount and you should be golden. I used M3x8's to install my mount to the Barracks. I didn't use a spring in my install and it's perfectly fine.
You'll likely need a longer cable to mount the screen, the one that comes with the tft35 was literally a couple inches shorter than what would be desirable.
My fix for this was to buy another cable and since I couldn't find one longer than 150mm I also bought an extension connector.
https://www.amazon.com/dp/B07RS4S4PG
I unfortunately can't remix the mount for some reason.
The author remixed this model.
I used files from the TFT35 SPI screen to help make a mount for the Barracks.