I don't know much about the Stargate series, except the initial movie. Are there different sizes of the stargates? Which one are you doing? Are the Chevrons the same for all the stargates? Is the bottom part supposed to be burrowed into the ground?
As I recall, we've seen six different "classes" of stargate so far:
The Milky Way, Pegasus, and Destiny gates are all approximately the same size, two stories tall or so.
The Tollan built their own gate and interfaced it with the Milky Way network. It was a bit smaller.
Orlin, one of the race who built the gates, managed to construct a single-use version maybe 4 feet across using parts from Carter's microwave and toaster. And some hefty credit card bills from online shopping, too.
The Orii, an offshoot of the race who built the gates, arranged for the construction of a massive Supergate large enough for starships.