Building Qubes .iso?

Yes, you can do it there.

Alright, cool. How would I go about doing that? What commands? Is it similar to what you gave me before?

Yes, it’s the same commands that you used for Fedora.
You can enter terminal with Alt+Fx after installer completes the installation and before you press on Reboot button and install kernel-latest there. You’ll need to have the kernel-latest package copied on some USB drive so you can copy it to dom0 root.

How would I go about copying the kernel-latest to Dom-0? Thanks

Assuming that /dev/sda will be your USB drive with Qubes installer ISO and /dev/sdb1 will be your second USB drive where you’ve copied kernel-latest package:
Instead of this step:

sudo cp /path/to/grub2-efi-x64-2.04-24.fc32.x86_64.rpm $mnt_path/home/user/.

You’ll need to run these commands in installer terminal:

mkdir /mount
mount /dev/sdb1 /mount
cp /mount/kernel-latest-5.17.7-1.fc32.qubes.x86_64.rpm $mnt_path/home/user/.

Awesome. Thanks for everything =)