What kind of time factor are you talking about. Was is a few months ago or a few years? A few years ago, I would be concerned, months not so much.
Has the estimated delivery date past?
Did you get an estimated delivery?
Frankly with these class of guns expect slow delivery, promises and screened calls. Whats too good to be true usually is. I cant see how any profit is made. In that cost range, one would assume a large volume of work and a struggle from build to build. I hope it works out for you.
A negative snowball, your deposit likely funded the build ahead of yours and so on and so on. Some time it all catches up and results are not ideal. That's a risk we take especially with the lower priced "Bargain" builders.