SWEET, VERY NICE, YOU GOT ANY MORE PICS YOU CAN SHARE? How old are your cables? are they frayed in any spots at all anywhere? if there is any chance that they are compromised anywhere, replace all of them. far as weight in the cabinets you can go by your gvwr. meaning all your gear. that don't tell you how much your cables will lift, but they are capable of quite a lot I just redid mine. take the tensile strength of 1 cable and times it by 4 that's a lot of weight they can handle. for example if 1 cable can lift 850lbs. the 4 of them can life 3400lbs. something I was going to do and wish I did was use 3/16" cable instead of 1/8 inch it will work too. (I think) I don't see any reason why it wont when I fixed mine. have a good 1.
I put 1/4 inch plywood on my ceiling it added a lot of weight but I have no troubles cranking it up or down. just make yerself some safety bars.
don't go tearin that apart