Someone asked for this earlier. Here is a high res pdf with the first 25 monsters. Some are my own creation for my own Felk More megadungeon, and others are conversions. I realize that on some of them, the specific monster design formula for 5e isn't followed, but the monsters work perfectly fine. Also I just noticed there are a couple ones in there with an old format (using level instead of CR). They're still workable, but you'd have to figure out a CR for them.