Capn',
funny you should mention stuffing the body of a hollow full of material to abate excessive/unplanned-for feedback. back in the 1960s I played a T-100 D model and had foam rubber pads stuffed inside the F-holes. after filling guitar's cavity, I followed up with duct tape over the F-holes.... that once beautiful instrument was sacrificed to 1960s ubervolume and stupid expediency. I had the devil of a time cleaning up all that mess when I later came to my senses about a decade later. But, we were young and poor musicians and forced to make what we had fill the genre niche we inhabited, whether the instrument was able to hack the demands or no. if not, we adapted our instruments to the need of the moment.
In those days I had 2 guitars... an acoustic and an electric. Both Guilds and even with the reasonablness of the Guild pricepoint... I had had to save and go without a lot of stuff I either needed or wanted to get both those axes. of course, at that time I was just out of high school (waiting for the draft to snatch me up for the green machine in vietnam) and working bullshit jobs that paid little or nothing... still, I was a performer and understood the necessity of sacrificing for the sake of my art. sorry, I babble when I start strolling down the memory lane,
blue