It also doubles as a cool SPQ2, leaving all monsters intact. A good conversion staying somewhat true to the original. It's a little larger than you remember, with an extended room behind the SPQ player start with lots of goodies. The rest of the map is as you remember.
Textures also look close to the original.
Looking very good, this one allows all the freedom of movement of the original and plays great with up to 8 players. Most everything is the same as the original.