Audio drama requires expositional dialogue to explain physical actions (because we can't see it).
Visual drama doesn't, it shows you the physical actions.
Merging these two together gives you the worst of both worlds, visual drama which isn't visual and is bogged down with expositional dialogue.
Besides the saber building itself spoils the surprise of the Trojan horse in Artoo.
All you would need to see would be Luke doing something near Artoo and perhaps his hatch shutting (like Leia putting the plans in him in ANH).
Which is why I moved the idea into Ben's hut because Ben would have the tools and books and merged it with Ben's ghost finishing the story about Anakin (bookending him starting the story in ANH).
It also looks (and I know this is rough) like Mark has hiccups and I can't see a way around that without not showing his face.