So far we're almost finished with the tank's wheels. It took a while to complete two of the four because there was something stuck in one of the pieces. We haven't used the SD card yet, but we know enough about how it works. We also brought batteries when we figured out that we needed them, but apparently didn't get enough. We got four of the six needed. I personally think that we'll be able to finish the tank within the next two weeks or so if we don't get distracted.