I have a 1994 SUNTRACKER party hut with the swim platform on top. I removed the top, (Yes, it was really heavy and awkward), and the wood does need replaced. I measured the marine grade plywood and noticed that it was 5/8". I am assuming that the roof was original, but could this have been replaced with 5/8" or do you guys think 5/8" is ok to use? I never felt any sagging while I was up there and I'm a pretty big dude. I don't want to add any more weight to the boat than I have to. Thanks.