Edit: How come post about a partition I did in 3 days outperforms a post about bathroom remodel I worked at for 2 months, lol.
The "thin pine boards" are laminated veneer lumber which does not twist. It's not the first door/partition I've installed and I've yet to receive a single callback. It's going to be perfectly fine. Absolutely no need to over-engineer something like this. I appreciate the feedback but I strongly disagree.