ok so im making an elevator mod. and also: HELP REQUESTED

heres a summary of my mod:
so theres a square platform that falls down from a really high hight. 3 walls surround it and fit titly against the platfrom and are used as the elevator shaft. there are also hand rests that stabilize the elevator. the elevator stops every 100 or so frames. then it continues its way down. when it reaches the bottom it explodes

my current mod problems:
so its a crappy elivator. it *bleep*ing jams all the time. the firction is 0 but its still screwing the elevator up. also the 3 platforms which are used to make the elevator stop (this will be explained in detail below) keep merging through each other because the joints are weak. is there any way to make is stronger. just try playing the mod, and you'll get the jist of why i need help

what i envision for the future
hopefully, the finished version will not jam, and i will have a mechanism that allows it to stop on the first floor. then if tori/uke do not get out, it continues to bacement level, and the elevator is propelled all the way up using a bounce 5000 block


how this mod works:
so basilcly i stick 3 platforms together and use thrust to make it stop every 100 frames. consider 3 platforms: AAA, BBB, CCC. they are arranged from top to bottom in that order.

AAA
thrust 999999 0 0 -100

BBB
thrust 100 0 0 100

CCC
thrust 1 0 0 10

so BBB provides a upward force of 100 every 100 frames. this makes it stop every 100 frames. but we dont want it to be flying upwards on the first frame so we counterbalance that with AAA. then CCC provides a force so that the elevator isnt in complete free fall when its not stopping.

other:
so the two pictures i have represent the elevator. its too big so i had to take 2 pictures. the first one shows the elevator and the shaft. the second one shows the bottom of the shaft, the first level, and the bacement/bouncy block. and please ignore the mod name... ill be sure to change it when i upload it. this makes it easier for me.

ok and HELP PLOX.

PS: ive like tried making this thread 3 times... and it screws up my computer every time. D8. sorry if this thread sounds a bit crude but this is the second time i wrote it, and i wasnt feeling very happy as i did. i apologise in advance.