I beleive in you! The only reason these people are getting such good results is they work on their project every opportunity they get without breaks. They also get really picky and only use peices that are perfect. Look at
ExCeLLuR8 's build! It came out amazing because he wanted to look as good as possible. Every time a peice was cut rough, there was a slight bevel(even if it was only for an inch), or he just didnt like how it ended up looking, he would recut until it worked. I know you can do this. Try again, dont get down, and aim for perfection. If there are any gaps, you need to glue it better. If there any seams, fill them. If there are edges and lines instead of a smooth curve, sharpen your knife and cut in one pass, rather than multiple small ones. All of these things will show up in your build if not eradicated the first assembly of those peices. Work hard on it early so you dont break your back later and strive for perfection.