Nice job on the PS
Is you BK working well enough to inject video at the grid of the video amp (V7) ? That should allow you to get the sync circuits working and see an image. I believe you could inject a composite video signal here too for your A/V jack, but you'd need to play around with the level and polarity.
As for audio, you can add a jack at C41 on the volume control for AUX. Maybe replace that 2 position TEL / RAD switch with a 3 position one
