I've had my hands on 4 supersport bikes using that tank. 3 of the 4 tanks were virtually unusable. They are almost always rusted out on the bottom and riddled with pinholes. I' ve tried to use several of them. The interesting thing is... You can have solid, but weathered paint on one of those tanks and when you sand it. You will find the rusting under the original paint. I think Honda had a special formula to make those rust prone.
Those can be hard to get in good condition, unlike the earlier tanks which are a dime a dozen.