I haven't commented on a post in a long time, but I logged on today to tell you I think you should go for it. I think people are often too squeamish about volume and frequency and that we are capable of alot more than the conventional wisdom dictates.
I was a weightlifter before starting PL, and I frequently squatted and pulled in excess of 5 times per week back then, sometimes twice in a day, and I made gains like crazy, both off and on the sauce. Nowadays, I still squat and pull 4 times weekly when I'm in-season, often with circa-max weights, and I pull in the high 600's raw.
Obviously, you should treat recovery like it's your job if you want to do this, and if you use drugs, up the dosage, but it'll work just fine natty as well as long as you are smart about poundages, rest, food, etc. Check out some of Mike Tuscherer's (spelling?) ideas for more about higher frequency training. Alot of his guys do retarded amounts of work and they tend to do very well, as do many European lifters I am familiar with who subscribe to similar ideas regarding work capacity.