Your price comparisons seem a bit weighted to make your options look even better than they are. Don't get me wrong, DIY will be cheaper than going 'official' regardless, but there are dual zone triggers you can get from other manufacturers for a fraction of the price of Roland ones that perform just as well. And on the cymbals front your pricing for the cymbals is odd, I found a VH-13 for cheaper than you listed a VH-11.
Apart from that though it looks awesome. Love the natural finish on the drums. If you ever find yourself wanting more out of the drum sounds, or if you end up going down the triggered cymbal route, check out some drum VSTs such as Superior Drummer 2.0 or BFD3. They use high quality recordings from real drum kits which sound amazing compared to the Roland generated samples.