Slip as the adhesive will work, but only if the panels are verticle.
I have worked with composite panels, and they don't like to span more than 48".
SIPS, structural insulated panels are rated with a span up to 12 feet.
But for any long term application, you
should not count on them to be structural support.
No, they don't last, or stay flat when used alone.
Put rafters or trusses under them and they are great, solid, warm, soundproof sheeting.
So making a panel of straw and slip is very much like adobe and has no ability to be put under tension.
But, if you mold the proper sized rafters inside the panel, on 24" centers, "Look Ma, no hands, woo hoo."