I don't know how accurate are those paper templates but it all depends how far you want to go. First of all, by now you should have a pretty good idea how heavy it's going to be and what motor you want to use. Keep doing it and don't get discouraged. The end result can be very rewarding.
I build my rata about 10 years ago. There were absolutely no plans, so I found a 3 view drawing on some russian web site. Ended up making my own plans. It was a great flyier. Powered by OS120 four stroke. and 70 inch wingspan.
Made my own retracts as well. Yes, it was a lot of headache at times but the plane itself used to turn heads on every occassion. Here are couple of pics. One in flight and landing. I hope it will go as well for you as it did for me. Btw, the plane is made by Mr. Polikarpov.