get a can of expanding foam in a aeresol can and spray it into the nose, make sure to get it between the nose and front bumper real good, the foam expands as it hardens and gives you a good layer of cushion in case you hit someone. The foam on the inside and a layer of the baseboard stuff on the outside will work great for protecting your nose. What i like to do is get some fiberglass and sand down the inside of the nose a little bit then add about 1/2" thick fiberglass to the inside of the nose all the way around to make it nice and thick. It doesnt add alot of weight when you do it right, but can if you add too much fiberglass. My noses on my bodys are 1/2" sometimes 3/4" thick and hard to bust. Usually when one does break its right where the front of the nose meets the bottom, along the edge, so thats the spot i try to thicken up the best, all the way around the front of the nose. The top part of it doesnt need thickened, just the middle and bottom part all the way around.
Would be nice to see some body manufacturers make a nice thick nose about 3/4" thick, they would last alot longer if they would, even if they was expensive it would be worth it not to have to buy a new body every 5 races!