You have 494 views of this thread. That's a lot of people following, especially considering there are only 14 posts so far.
I think the lack of written response to your thread is simply hovercraft are a specialty, so there are not a lot of people making suggestions, as there are not many experts here.
I have often contemplated building an RC hovercraft, so I am really enjoying your thread. Who knows, maybe one day I will.