Ahoj Teresa,
Welcome to the forum. Here are a few sites that will have what you are looking for.
Jay's Box of Sci-Fi CardToys | ...stuff hard to find anywhere else
PaperAviation - Kartonmodellbau made in Thüringen
planet (0) StarFreak - Paper model: Stargate
There are a few designers here on this forum (as well that are creating add-on parts for some of the models taht are out there as well).
There are more out there, but I hope that this will help.
If you want more then this, just google Stargate paper crafts (if that does not work then just play with the words.
You can also scratch build something, if there is something that you want that is not out there.
Good luck.