Simple popup parts list (all dimensions are estimates, please check before you cut your materials) 25-30" stroke air cylinder, double acting with >1" bore PIR motion sensor with 6sec test setting Solenoid valve, 3 way normally closed air regulator bungee cords two L frame brackets about 4" on a side to make moving armature 63" of aluminum L bar 1/4" thickness 1" on a side cut in (35", 14", 14" pieces for the vertical cylinder support and the feet of the base) 114" of 1/8" thick Aluminum flat stock 1" wide (each arm has a 16", 14" and 12" piece)(they is two 13-15" pieces in the base) 3/4" PVC (1 tee, 1 cap, two 12" pipe for each sholder, small pipe pieces in the neck, pipe pieces to create the hands) ABS Black pipe two 10" long 1.5" dia pieces for the forearms ABS Black pipe two 8-10" long 3" dia pieces for the biceps 4ft dowel 3/4" for the sholder and connecting the PVC/wire form hands to the flat stock assortment of 10-24" machine screws/ washers/ lock-nuts to make the fixed and rotating joints wire hanger-hot glue constructed hands plastic or styrofoam Head burlap robe Motion sensor, screw in lamp plugs, and gang box, 3 prong plug and cord to wire up and trigger solenoid valve. NPT pipe fittings and compressed air quick release fittings for connecting compressed air to solenoid and to air cylinder. Use Teflon tape to get good leak tight seals. Compressed air hose. 3-way Solenoid valve with 1/8 or ¼" NPT connections. 24VDC is common and will need 24VDC wall transformer to plug into the motion sensor. 110VAC is simplier, because you can plug directly into the motion sensor lamp socket/plug. Small air regulator ($20) at Home Depot, so you can dial down the 80psi local air reservoir, so you can have a control 20-35psi at the prop to accurately control the speed of the prop at the rise. Need a NPT pipe Tee if you use a 2 way solenoid valve, so that on the prop side, the air has another route to escape after the air is turned off to the prop. Turn the valve, so that just the smallest amount of air escapes this way. You don't want to loose lots of air while the prop is on. This will control the prop reset rate. You can go with a NC (normally closed) 3 way solenoid valve to allow for the prop side to vent through the 3rd orifice, but it is more challenging to find good salvaged 3 way valves. A NO 3 way valve will vent the wrong side.