Newbie dio builder here looking for advice

Im about to start a dio featuring an M8 Greyhound undergoing maintainence and a GMC truck loaded with tools etc .
I was wanting the setting as a farmyard ,and was wanting to build a farm ourhouse or shed from scratch.
What is the best material for planking , i was considering plastic card finely scored to reperesent a grain effect , would this work or do you have any other suggestions like balsa ???
Thanks in advance
Ian
