That's bang on standard size wrt it's footprint for a single adult beardie used my most keepers here in Australia, the height should be fine with an 80W MVB too.
If anything the little hatchling might find so much space overwhelming at 8 weeks old. I have my hatchlings / juveniles in 100L rearing tubs and they are now 9 months old, will be upgrading them to similar sized enclosures soon as I can get the materials on hand and can build them.
That said, he'll soon get accustomed to the expanse of it and will soon grow into it.