I would say it would be fine, the only problem would be warping as the pine will be quite thin (plywood is more resistant to this).

But if you don’t care about everything being perfectly straight I think pine would be plenty strong enouph and wouldn’t warp noticeably much either (just pick straight boards from the store). So yea I think it would be fine.

P.s. (if you join multiple boards together its usually less likely to warp but I don’t think this is necessary for your usecase)