A quick trip to the Office Depot yielded decent results.
For Tempore Atlantia, I got a folding tabletop easel and a pack of professional report covers. The covers are linen-look paper, embossed with some geometric shapes, and with cutouts. You can slide in a cover sheet that shows in the front window (and highlights some ornamental cutouts for good measure). Inside, there's a pocket for the documentation.
What it doesn't have is a good place to put the music; I've paper-clipped it to the back of the front pocket, that holds the cover sheet. (I'm not explaining this well, am I?) Suffice to say, you see a nice report sitting on an easel. You open it up and there's sheet music on the left and documentation on the right.
I may leave a recorder with the entry, for "do it yourself" investigation of the tune.
For Poeta, I have another report cover that holds my nine-page entry. But then my poems are buried inside it. Not wanting to spill out for another easel ($15), I bought a cheap, colorful paper folder ($0.80). I printed out full-page versions of my two poems and paper clipped them to the inside. Now I can stand the folder up and open on the table and put the pretty documentation on the table in front of it.
I have ideas for fabric-covered foam core, with scrapbooking-style photo-corner holders set up to provide modular yet attractive places to insert papers. Pros: Lots of space, easy to read, can be decorated with persona-appropriate borders and ornaments. Cons: Will look like a science fair poster, somewhat large to transport, somewhat delicate.
Or: I leather-bind a 3-ring binder and decorate it like a medieval book cover. (Or get some wood panels and do the book thing for real!) That could be a project in and of itself.
(You understand we travel with enough baby gear to launch a toddler's assault on Mt Everest, and sometimes with my instruments. Cramming a 12" x 30" x 1" pile of foam core on top of the garb, gear, instruments, stroller, etc etc etc in the trunk can be a challenge.)