Shame there wasn't any shots from the side and back showing the construction, although you could probably check the baby size ones out in a store to get a general idea. Maybe even buy one to use as a small scale model. Just needs to be beefed up in size and strength of materials to handle heavier weights without bottoming out. I usually don't care much for adult size baby furnishings, prefering the real baby items instead. But this I like!
This is kind of neat too, for a more contemporary high chair - Bome Designer - designed for toddlers, but sturdy and roomy enough for adults to sit in.