SystemRequirements

ravynOS is intended to be comparable to macOS® and run on fairly modern hardware. In general, it should run on any recent PC hardware since ~2012 that meets the following minimum requirements:

UEFI
4 GB RAM (8 GB or more is recommended)
64-bit 2 GHz dual-core Intel or AMD (i.e. x86_64) CPU (4+ cores is recommended. MOAR CORES. ALLLL THE CORES!)
Intel IRIS, nVidia or AMD Radeon, VMware/VirtualBox, or VESA GPU compatible with X.Org and FreeBSD
20 GB SATA, SAS or IDE hard disk/SSD/NVMe (100+ GB recommended if you plan to hack the code)
Keyboard & mouse compatible with FreeBSD & X.Org X Server. (Most PS2 & USB devices including touchpads will work. I2C devices may not.)
Wired or wireless network controller compatible with FreeBSD 12.X (Broadcom 43XX, Intel, Ralink and many others.)

You can check individual components on the FreeBSD hardware support list.

Virtualization

For qemu/KVM with virsh/virt-manager choose (tested with v0.3.0):

create new VM
select FreeBSD 12 as OS
choose ISO as install media
create a 20G HD
CAUTION: before clicking "Finish" - click on "advanced configuration": select UEFI instead of BIOS and select i440FX-Chipset (if you use Q35-chipset, virtual graphics tablet driver - as a mouse replacement - might not work)
do not start the VM yet, first set CD-ROM to SATA-type, set Harddisk to virtio-type
activate, boot menu, change boot order to boot from CD first, after install change it back
set Video to VGA instead of QXL
in order to have a "free mouse", you can choose to add "EvTouch USB graphics tabler" --> with booted Desktop, your mouse should 'escape' the vm easily.
in the TianoCore UEFI (Enter with ESC) it might be helpful to change preferred screen resolution (Device Manager > OVMF Platform Configuration) to something greater than 1024x78