If thats what youre into, then by all means. Everyone has their own tastes, but that shits not for me. Some cool features, but Im pretty happy with my 4dr 510. Car seats fit in the back fine, I can seat 6 with my bench, could be manual if I wanted, carried an engine once (not on a pallet though), and looks 1000x better than any minivan IMO.
And I dont know what youre smoking, but each generation of Silhouette looks very similar to each generation of Previa. They just happened to keep making them so the current ones are now more stylish.
No matter what you do to it, its still a minivan and personally "pimping it out" doesnt do it for me. If you love it and want to rock it, more power to ya. :)