Poormans Drawbridge and Moat

im a noob minecrafter and here i am to present you my drawbridge.
i dont use cheats or mods(except optifine) while playing on survival mode.
i live on a Taiga biome so its hard for me to find slime spawn areas.
so this drawbridge uses regular pistons, gravel, red stones, red stone torches and lever.
i made this on creative mode because its the only quick and easy way to show you guys
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my computer is slow so the video is crappy, i will upgrade it soon.
i will post tutorials on this if any one wants