How to install Ubuntu 20.04 to Linux me raid

So my goal was to complete the LVM & LUKS tutorial you did with the mdadm component. I opted for the md raid route as i only have two slots on the mobo.

The reason for this arrangment was to learn LVM, gain speed, rolling ubuntu distro, and distro hopping. Encryption a plus but not necessary.

I’ve been trying to get it work on ubuntu but your tutorial is on arch. So there are a few things I’m probably missing because i’m not a natural with linux.

Here is the layout:
image

I was going to use the old ssd as a cache for the old rust (later data)

Thanks Wendell - greatly appreciated.