I see no issue mate, you just need the second best slingshot making tool....a.... machete!Nice. I have been searching for an oak tree while I am here in Illinois this week but the trees are so thick on the sides of the roads you can't even walk through them. Not to mention there is no place to pull over on the sides of the roads.
I figured I could buy a cheap saw if I find something but so far, no luck. Here is a pic of what the sides of the roads look like.