That is plenty wide and stable enough to put a shooting deck on. Is it 48" wide on the floor and 54" at the rails. 1448 is a pretty common size for a boat but other than a few manufacturers like Weldbuilt, Redneck, and a couple others I have never heard of a 1454. Polarkraf measures them at the beam and not the floor I think???
Anyway you should be fine. Keep the deck low maybe just a couple inches above the rails at the most.
With a boat that size you might want to stick with a tiller motor just to save room.
Pics would really help.