A pinstripe would be a great choice. You might even try an emperor for a really open sound. I wouldn't do anything with much muffling because of the small size.The first time I converted an 18" floor tom into a bass drum I used a regular ol' pinstripe head and talk about a thump and resonance! It was great. I would imagine a 16" would be the same effect. However, unless you plan on miking the drum up, I wouldn't port the front. Play it wide open because at 5 feet in front of the drum, The audience won't get any ring you might be hearing from behind it.