Hooray! I have been putting in a lot of time to this pencil roll and it's finished! I'm pretty happy with how it's turned out: I am not a natural seamstress and it was all hand stitched. (Which had more to do with my lack of a sewing machine as opposed to pure masochism).
The top orange flap is open, so I could pop my diary in there and just fold the roll over instead of wrapping it up.
But the top can also fold down to protect my Muji pens when necessary :)
This is the back side....
And all wrapped up and ready to go!
Upshot: I'm very excited to have tried something so new. It feels happy and good to try working with fabric - I really hope to get better with practice. And every time I reach for a pen, it's so easy and fun!