Is money earned from helping students showcase their architectural projects considered permissible (halal) or forbidden (haram)?

It is permissible for a teacher to help students prepare projects if that help is outside the scope of evaluation, and the matters are perfunctory, not intended for the student to do on their own, and the educational system does not prohibit it. Anything other than that is forbidden. Determining what kind of assistance is permissible is left to those with expertise. Money earned from forbidden work is not forbidden to benefit from, nor is it obligatory to dispose of it if the person was unaware of the prohibition.