It depends on the kit. Some are available and some aren't as easy to get ahold of. Some companies like Great Planes usually put a 3-view of thier planes in the instructions for each kit, which are available online. Some companies like Sig are a bit harder to get ahold of. I have a lot of outlines that I've collected over the years. Let me know what you're looking for and I'll see if I have it.

Ken