I built a 5 string bass this summer from warmoth parts. It has a maple neck with maple fretboard and a swamp ash body. I think it sounds a bit dead. It doesnt vibrate that much acoustically, and its breaking my back by the end of the night. The neck pocket is really tight, and I use string-through for E-G. I want to route a tone chamber from the back of the bass on the bass side. I drew out a templete to follow avoiding all obsticles by at least a quarter inch, and I have some quarter inch maple laying around that I will use as the backing plate. I love the thud of my arch top, and I am hoping that this will add a bit of that sound. Currently I have basslines stacked J and a ceramic MM pickups in there. I am switching over to thier 67/70 pickups using one 67 in the neck positon and two of them in the bridge (custom wound for humbucking). I am going to start working on the plywood templetes tonight. If there are any super bad consenquences from doing this please let me know. If all it does is make the bass lighter, then I will be happy about that. Also, I have the thickest strap I could find (peavey cirrus strap).