Well done, Raven! So cool to see your work shared in that way. Be prepared for more requests to start coming you way! 🙂
What you might try is going visual right from the beginning, but in pencil first. Wait until the presentation is over before going to pen. If you only have to make small tweaks to the overall layout at that point then my guess is you’d be saving yourself some time (maybe another 25%?).
Also, thanks for bolding your question! Makes me want to put together a style guide for forum posts with tips like that.