I'd thought the Bounty Hunters out there might like a link to the famous BBC. Over on Imperial-fleet.com. A good set of blaster plans are over there and techniques for building you some PVC hardware! Not exactly Mandalorian, but a good scratch building prop reference none the less.
Also, check out my site, http://www.tk560.com/blasters.html to see some pics of my Imperial Stormtrooper Blaster made of plywood, PVC pipe fittings, and Bondo.