[wip] extremely small 12x12 seamless piston door

i got this idea out of nowhere, unlike most ideas. the projected size is 17x13x31 with a volume of 6851 blocks. there is no projected opening time yet but it will likely take at least 10 minutes to open. projected time will be added later once the door is devloped enough. here is a screenshot of what i have so far also, please tell me if this is the first without sand or flying machines(i’m using observers) or worlds smallest in general.