This is one of my favorite builds. Steinbrink - welcome to the forum. I think everyone is aware that this is a tribute build especially when the the OP confirms it's a vintage lawn mower engine. You'll find most builds on the forum have logo's that weren't placed there by the manufacturer. It's all up to the builder. It's a tribute if the builder is honest, a fake if they're trying to pass it off or sell it as the real deal.
Still an awesome build and I'd love to see what he's been up to lately.