How to properly build a minimal FreeBSD kernel?

Is there any proper way to build a minimal kernel for FreeBSD? The FreeBSD Handbook has the lack of information about this. By default /boot/kernel directory has the pretty big size - around 450MB. I want to minimize kernel fingerprint and remove all unnecessary kernel modules and options. Should I use "NO_MODULES" option in /etc/make.conf? Or use C compilation flags?