I am planning on building a flexi for my older Sony Wega it is a 36" weighing 230lbs. I plan on making a three shelf stand, bottom two shelves 3/4 mdf for equipment, top shelf two sheets 3/4 glued up for a total of 1.5 inches. My question is about the threaded rod I plan to have a rod at each corner and three in the center of the rack from front to back. I purchased 5/8" it seems extremely strong but I would like a second opinion. Thanks for any input.