So the whole tail wheel will be removable? you can't get enough weight in the tail, so add anything back there you can. Curious to see how this bad boy balances. One easy place for weight, fill the elevator tube with epoxy and steel powder or lead... ;-)
Good luck brother, I'm really glad I chose the 135... I was shocked at how much bigger the 150 is. My plane weighs just under 50 pounds right now, interesting to see where you end up.