Finally, someone actually made an Ecto for GTA 2! Been waiting for that. Probably should've asked around.
Regardless, I bet making a mod for GTA 2 would be quite easy. Use the Ecto, re-draw what the main character wears, and make the main weapon the Electrogun, or whatever it's called, and convert it to the Proton Pack. Change gang phone call jobs into bust phone call jobs on the run. Draw some ghost animations and try to get as much dough as possible. That would probably be pretty easy.
For someone else.