Dark Raven Designs make excellent products which are not only reliable but second to none in my opinion. They are a local vendor where I live in Buffalo, NY.
To answer your post, the owner is more than likely in China still. They had a huge overseas order/project with another local haunt. Spoke to the owner last week to check the status of our order which hasn't been charged yet.
I was told he'd be back by the end of June. Orders on deck to be started asap early July. If you're trying to order anything from Dark Raven now (especially an order that big) don't count on it.
We waited too long to order an animatronic last season (as in by early June) and missed out due to so many orders before ours, not to mention the building material they need to make their props.
That's as much as I know, but should definitely answer your question as to why you haven't been able to reach them!