You guys are really supportful. You never tried anything just because you felt like you could? I actually praise people like this, since I always felt this was the whole thought behind DIY - take an idea and make it happen. I'm pretty sure someone would have told Smeggy he was stupid for ruining pairs of perfectly good T50RP, but in the end he came up with the Thunderpants.
However ssrock64, a lot of people have thought about this. The Portapros are cheap, have an easy-to-love sound signature and are DIY-friendly. I once tried to use them in a different enclosure too. the thing is, they only sound good vented, if you put them in a closed space they muffle up. My advice is to try it if you already have the Portapros, you have nothing to lose (unless you damage the drivers). If you feel like the sound is bad, maybe use something designed for a closed shell like this
.