oooh you're going to make it out to clay and wood, that sounds much fancier than my cardboard stargate
. I hope you post some pics of it, I'd love to see how it turns out. One thing that kind of irks me about the show is that they don't use many vehicles to get through the Stargate. Other than in Atlantis, you would think that SG Command would've developed a good vehicle to take through the Stargate.
I believe the Humvee fits through the gate, or at least the semi-scaled one that I made. Though why they wouldn't transport helicopters through and then reattach their rotors on the other side is a question as well. It's probably expensive if you can't bring it back to the planet with you, but I'm sure they could find a way to do it.