Question ,all of you luthiers who think they know more than me, and DO!!!...I found this possibly South American beauty a couple years ago...No nut or bridge to go by...Kind of like the first real Strar Trek when the aliens didn't know how to put the human back together again..SO.....I made it a 12 string thing, with octaves on the high strings...tuned it to A,....It held up well for a couple months, then it began to buckle a bit on the top side of the sound hole...Loosened strings and let it sit..I would like to make it go again, as, it was louder than the accoustic guitars that I used it to jam with!!!!...And the sound of this high strung octave instrument was UNBELIEVABLE!!!!...SO...Question.....Should I put a small..(possibly graphite composite )..brace where it was buckling??...And,....what string Gauges would one recomend for this????The scale is very close to mandolin....AND!!!!!...What the hell is this darned thing????....Don't put your lips on it son....get away from that darnded thing!!!!