The diSPIM is inherently modular and easy to modify.  Here are some variations on the basic diSPIM system already being used:
-  single-sided system with high-NA imaging objective (e.g. same objective used for lattice light sheet) 
-  moving sample through fixed light sheet with XY stage 
-  emission filter wheels for better channel isolation 
-  turret on bottom for different objectives (useful especially when doing photomanipulation) 
-  photomanipulation from inverted microscope objective using ASI scanner and  Projector plugin-  in Micro-Manager  
-  gated laser illumination in certain range of slices to avoid stimulating photosensitive section of sample 
-  “anti-striping” or altering the angle of the beam to avoid shadowing effects 
Other variations are in development by ASI, Hari Shroff's lab, and others.  What do you want to do?