Don't forget supplementing that prototype feeder with gallons of cayenne pepper, mint spray, essential oils, concoctions made of cornmeal, baking soda, processed nuclear waste and eye of newt, then sit out after dark slapping mosquitoes with a night scope trying to shoot mice.
That is a good bit of advice for a humid area but it leaves the feed open to rodents during the day and eventually the rodents will find it and create a problem. I'd recommend a treadle feeder but only put enough for one or two days or I'd add a low wattage bulb in the top of the feeder to keep...
"water proof" is tough, water resistant is achievable. When you get into blowing rain most feeders need some sort of overhead cover. The swing back door feeders do better than the guillotine style feeders where water puddles up behind the feed compartment. One trick is to bend the lower front...