It's not something I have planned, but it would be possible to remake the old levels in the level editor. Some of them would need some changes, because a couple of items are missing or work differently, but I reckon you could get pretty close.
One thing I've noticed is the different behaviour of keys and locks, like one key = one lock and you take the key to the individual lock. Rather than taking a key to one lock in one place, and it opens all the white doors in the level at once (and there are sometimes other things that can close them all again).