i am doing something a lot like what yo did, mainly cause you gave me the idea a while back and just started now. im using legos as an iner structure to build off of, and have found that oce the silicone is dry, they peel right off if stuck, no messs, no extra paper, no hastle. im 16, hense the reason im using legos, some of the older folks might not have such easy accesss to it tho lol. i have one drying right now on it and i will take some pics of them tommorrow. mine are fully enclosed though with one opening.