From what these photos show (better photos would be easier to work with), he's a nice looking fella. I think he looks like a typical Belgian to me.
Have you actually used a stick with a level to measure him? There are certainly 18+hh Belgians, some show hitches can get gigantic...
And I know this is picky and everything, but since you brought it up, he isn't a gold champagne - at least not one single photo here makes me think he is. His eyes appear dark, and there are no freckles on him, he also doesn't appear to have a diluted coat - champagnes MUST have gold or green eyes AND freckles, and usually their coat is obviously diluted (golds can mimic Palominos and ambers can mimic Buckskin... But none that I have ever seen look red). Aside from that, I think you are quite correct, I have never heard of champagne in Belgians - from what I understand ALL American Cream Drafts are champagne though (or perhaps it's that they need to be to be papered...). Just a totally useless bit of information there. To me he looks like a flaxen chestnut like most Belgians I have seen.
He is very cute, and looks like he has a great temperment! Looking at the before picture, he is very lucky to have found you!