i think your heading for trouble but some people are surprised by my stock list so it could work, nothings set in stone with cichlids.
if your tank is only 4ft long then the JD will eventually take up probably half that for itself if it survives as ive read that juvie JD's can be a push over.
this then pushes 3 rather aggressive cichlids into 2 ft of tank space.
jewels can be extremely aggressive, i had a 2" one that started a fight with a 7" (ish) midas within 5 minutes of being introduced to the tank.
if the JD reaches a decent size i think you will end up with 2 fish in the end, possibly 3 but thats doubtful. which one other than the JD im not sure.
just my opinion though.