The features and stats of your new Tanks/Defenders are subject to your Sample Tanks you have. Each tank will be crafted randomly by algorithm so there are billions of combinations to make sure that every tank is unique. Please note, every tank will have a crafting limit of 7. After 7 craftings, a tank can no longer be used as the Sample Tank to reduce the homogeneity in features of new tanks.
Upon each crafting, there will be a default success rate starting at 60%. You may lose all consumables including $Place, $GEAR, blueprint in a failed attempt. By adding Tech NFTs, the success rate of crafting can be increased. 4 Tech NFTs can be added, each would give 3-6% success rate boost.