Good luck and Godspeed, @agmoore. You will finish. I somehow feel confident of that. You are motivated, your husband is finally ready to talk about his experience, you both feel that clock ticking, and most importantly, these personal experiences are stories that must be told.

p.s. Video and audio transcription aren't very expensive. One approach could be to interview him while recording, without writing. Just listen, prod, ask him what that was like, and see if you can spend your valuable energy pulling the stories out of him. Then you'd have more of an editing project than a writing project. Just an idea! Hugs to you.