Creating mandatory field in a form once another field is updated

Hoping someone can help!

I have a form that has a field called status after inspection which is linked to a table which has approx. 20 status's:

I need when 20 of those status if one is selected into my form for the fields diameter & height to become mandatory fields (both these fields are dropdown) and if any of the other status's are chosen to have diameter, height and complete (date) field mandatory.

Can this be done?

Only one status can be entered per job but if it changes the mandatory additional fields need to activate.

Hope that makes sence.