Not bad, but it'll be good to see how it develops. If it's too much trouble (and redstone circuitry is always a pain in the posterior) then it closing gates aren't a necessity.
Crash, I used a double door with pressure pads and iron doors in my old lair. I don't know how well it would work with pistons but with mine it was an absolute pain to get through. Also, mobs can activate pressure pads so if a creeper chased someone into a gateway, it could get through.
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