Interior lighting

Is anyone experienced with installing a recessed 12v flourescent fixture into the ceiling?  This means a rectangular cut-out in the inner aluminum wall of the shell and are there any concerns with doing so?.  There are light units that required but 1" of recess.  Other unit types can just be surface mounted.

I plan to add flourescent lighting (2 single tube fixtures, 15watts each) over the main using a good color rendition F15T8 bulb.