Snakes, being shy, might prefer smaller spaces. But every single one of my legged creatures lots to have tons of room. Especially my Leopard gecko. He is ALL over his tank. Uses all of it.
I think if you filled that up, it would be just fine for him to grow into. Monitor his weight, obviously, and the other concern would be UVB exposure. So focus on creating an attractive spot where he should be basking, then monitor. If need be, you can always use a temporary divider to reduce the size.
Edit: I have those exact tiles in my enclosure. You're going to love them! Did you silicone them in place and seal the edges? My only regret is I didn't have time to let silicone cure, so I opted out of it. Well worth it to seal the edges, haha. Otherwise it gets a little 'fun' to clean sometimes.
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