Could I get away with
Open Water:
12 Cyprichromis leptosoma

Rocks & Caves:
2 Julidochromis or more if I cut the chalinochromis
2 Chalinochromis brichardi <-- Could live without these

Shells:
6-8 Neolamprologus Multifaciatus

So this is what i have so far.
I'm really excited about three of these species. Is there anything else I should/could add or would this be a good start?

I was thinking of having a shell pile on one side. with the middle be open and a rock tower on the right side. This scares me though because it seems like it would look pretty unnatural! Any advice on aqua scaping?