I may raise other issue is that the 25 KVA outdoor transfomer as far you are aware with weight of the unit and with portable walls I know some are using the " 2X4 or 2X6 " wall stud the latter may support without issue but the other thing is you may need a local disconnect switch on primary side.
That part you will have to check in your Canada regulations for more details and I know most transformer I mounted they generally recommend on noncombustable walls unless you put in a spacer plate to seperated it somehow { with manufacter instruction } and have it passed it.
Merci,
Marc
