Well in all honesty, It wouldnt be my first choice of material. I feckin hate the stuff. Ply would be my first choice.
But...... It will do the job. in my opinion.
It would need to be glued and screwed, and if he wanted to beef it up... Double up on the end panels.
Most importantly, a coat of varnish to prevent it getting damp.
We'll get some feedback from the customer, before we do a second version..
it took about 15 mins for that..... modern software makes it easy..