I think one of the advantages of using drawer slides is that you can get locking ones that will lock in/out, and that's what I did for the drawers in the back of mine. I found UES in Dandenong to have good pricing and quality slides.
And Mudrunner, I am a bit confused? Marine ply is available in multiple thickness's! It is certainly heavier than the normal hoop pine ply and with all the hoop pine plys now using waterproof glue so they are quite water resistant. In my opinion the difference is more about marine ply being harder wood, screws gripping better and the face's have a superior finish.
That being said, I used a amerind product called lighta ply, which is as the name mentions very lightweight (but not as strong/stiff) and is commonly used in the caravan industry. I found it quite good and my drawers are very very light, however it is quite soft and next time I would probably use marine ply instead.
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