kk, heres the mod, its basicly a platform moving up and down, and it has the principle of the piston thing made by shook, though the platform wont stay straight lol (any help on that?)
pics:


Note: i didnt spend that much time on it but it works pretty well anyway =D
Note2: the time spent on it was over 5 mins, had to finetune it, kinda lol
EDIT: fixed dismemberment problems