Framing a window seat

Time to build the window seat of the built in.  I've made basically, a small wall out of 2x4's for the front framing.  I've sheated it with cabinet grade plywood, and added the front box trim.  It isn't until now that I anchor the whole assembly in place. I can position it right where I want it at this point.  After that, I've leveled off a ledger board on the wall, and trimmed out the top in preparation for the lids that will open so the inside can be accessed.