From the pictures, it looks like those are screw holes, and placement is wherever the owner needed to put a screw. Given the number of holes, I'm betting the core is pretty soggy.
Anyway, beside the point. You can get a better board on craigslist for less than $100 right now, probably with bindings. Why would you put any more effort into that dinosaur?
Yeah, that's me, Tracer Bullet. I've got eight slugs in me. One's lead,
the rest bourbon. The drink packs a wallop, and I pack a revolver. I'm
a private eye.