Well...Im not sure what picture you see with a 4" hole in the grill bottom. The only pic I see has the bowl sitting in the cart. From that picture alone, I see no holes in it...unless Im just missing it. I don't even know if thats a Weber bowl or not. I don't see any daisy wheels on the bottom. It could be a Weber, maybe its not? Not sure about the whole cross bracing either.
Here is my opinion. The cart itself is pretty cool looking, whether its a Weber or not. It looks to be in good condition other than needing paint. I think it would be cool if it was painted white - like a Seville, and had some colored Weber grill in it. Red would look very cool of course. I think it appears an 18" would fit in there? So the question is...how much do you want a wrought iron cart that will fit a kettle into it? We know they are difficult to find...Weber or not. How much is it worth to you? Me personally, I think 100 tops. Let us know what you do! Good luck.