Hmm well it would be easy I guess to just make classic into 3d but on the other hand that wouldn't maybe be a super awesome move if you at the same time want to show off the engine to developers. But the 3d guy they hired was really terrible so that was also a bad move, the former artist was much better (Tiffany) xD
The OoT feeling you guys got was probably from the "dungeon pack" that they bought from garagegames when making the newest Graal 3D that never was released, to save time I guess
They should buy the new "Enchanted Forest" pack maybe as well it looks cool xD
