Cross compile the whole Kali rootfs content with custom kernel and custom toolchain

Hi Everyone,

I have some Embedded board which comes with it's own toolchain, build system and kernel tree.

I want to take Kali distribution sources and to compile the Kali distro using custom kernel and custom toolchain.

Is there any build system of Kali in which I can define my kernel and my toolchain?

If not build system, then are there any Kali distribution source files available which I can re-compile with my custom toolchain?

Thanks!