I am writing a small guide and will post it here, wait a bit 
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Rookie’s guide to run Kali on Qubes OS
by Fatima Rookie Ethernal 
I read this instructions:
https://qubes.3isec.org/pgp.html
I downloaded unman key from his GitHub TO AN APP QUBE:
I downloaded the kali-core template from here TO AN APP QUBE:
https://qubes.3isec.org/rpm/r4.3/templates/qubes-template-kali-core-4.3.0-202608282122.noarch.rpm
IN THE APP QUBE I verified unman key by running this:
rpm -q gpg-pubkey-c8c0c2ef --qf “%{PUBKEYS:armor}” | gpg --show-keys
and checking the hex signatures against the ones in:
https://qubes.3isec.org/Templates_4.3/
Again IN THE APP QUBE I imported unman key into rpm by running:
sudo rpm --import unman-complete.asc
Again IN THE APP QUBE I verified the template by running:
rpm -K qubes-template-kali-core-4.3.0-202608282122.noarch.rpm
I copied both key and template to dom0 by running this in dom0:
qvm-run -p YOUR-BLOODY-APP-QUBE ‘cat /home/usr/YOUR/BLOODY/PATH/qubes-template-kali-core-4.3.0-202608282122.noarch.rpm’ > YOUR-BLOODY-TEMPLATE-NAME
qvm-run -p YOUR-BLOODY-APP-QUBE ‘cat /home/usr/YOUR/BLOODY/PATH/unman.asc’ > YOUR-BLOODY-KEY-NAME
Now in dom0 I imported the key again:
sudo rpm --import /YOUR/BLOODY/PATH/YOUR-BLOODY-KEY-NAME
Then I installed the template by running this in dom0:
qvm-template --keyring /etc/qubes/repo-templates/keys/YOUR-BLOODY-KEY-NAME install /YOUR/BLOODY/PATH/YOUR-BLOODY-TEMPLATE-NAME
Again in dom0 I made a copy of the template, just in case I break it:
qvm-clone YOUR-BLOODY-TEMPLATE-NAME YOUR-BACKUP-BLOODY-TEMPLATE-NAME
Using the graphical Qubes-Manager, based on YOUR-BLOODY-TEMPLATE-NAME, I created an app qube named YOUR-BLOODY-APP-QUBE
Again using the graphical Qubes-Manager, I gave it more private storage, just in case
Again from dom0 I run my app qube, and everything works:
qvm-run -q -u root --service YOUR-BLOODY-APP-QUBE qubes.StartApp+qubes-run-terminal
now in YOUR-BLOODY-APP-QUBE run apt update & apt upgrade
Still to do: install tooling
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*** end of this rookie guide ***