Dual hacking lab advice

Looking for advice

Hi, I am looking to set up a pentesting lab. I have two old systems, both capable of running Linux. I want to use one as a torified firewall system from a live disc/usb or installed on the system and then the other as a pentesting lab connected with an Ethernet cable.
Could I use whonix gateway in the 1st system then connect to that from kali?
Can ipcop be torified?

Any advice or how to’s will be appreciated or if you can point me in the right direction I will be grateful.