That's a VERY sweet-looking model. It could easily work as a Lyran ship; the only question I have is scale. It would work very nicely as a fighter or PF, but the thing's got a lot of great detailing that would be wasted on something so small. It could be a frigate or destroyer, but I think you would need to reduce the size of the windows a little for that. If you wanted it to be something larger - light cruiser size or larger - you'd really need to reduce the size of the windows, unless you really want four-deck-high windows on the front.
But it's an excellent design - I think the Lyran designs largely need improving anyway. They're great designs, but they just have too little volume compared to the other empires' ships of the same class. This is cool.