As of now it's an interest check of sorts; they will only start production once 50 units are confirmed! I completely understand wanting to see what the actual product looks like, but rest assured a sample will be sent to me for approval and tweaking before the rest are made.
I can't speak for Plush Wonderland but based on other listings with other VNs it seems like once the design is final, you can also purchase it afterwards!
If I may ask, which plushie was it and why wasn't it to your satisfaction? Just so I know what detail to pay attention to should the campaign succeed :-0
It was Sol from The Kid At The Back! I didn't like the face proportions at all, his head is mostly ocupied by his hair so his face was all squished at the bottom and it looked ugly/weird. Why do you have all that forehead for dude lmao.