It seems to me that all you'd have to do is to take the plans for a treadle and blow them up to make the treadle a bit bigger. Then figure out something light weight for the lid.
I had to look it up to find what a treadel feeder is... It wouldn't be so bad but you said treadel and my brain saw 'tread mill' so I was picturing a broad breasted turkey on a tread mill getting exercise while eating
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Can't you just see them wobbling back and forth dipping their wings for balance and scarfing as they go. I got one tommy that we call Chester as he looks like he could use a EEE size bra. I can just see him giving himself some good smacks in the beak every time he tries to eat.
I know you can use a metal auto Dog feeder............. my turkeys steal dog food out of ours all the time. If we raise it any higher the dogs can't reach it....