OK so a little update, I got my NOS 1C6 tubes in today and my radio is now mostly working, it is now definitely oscillating (I did the holding another radio up next to it trick and that second radio was picking up this radio's oscillator signal).
But its still not picking up any stations unfortunately.
I've got the IF cans Aligned to 465 kC the Best I can (seeing as neither of the IF cans in this radio are original to this radio and are not 465 kC cans).
So I'm kind of not sure where to go from here now.
Here's a video showing what the radio is currently doing:
https://youtu.be/e702udS6aiM