I love the looks of those bikes!
For now, there hasn't been a lot of mention of those types of bikes (I think we've only had two mentions of chopper bikes). I think it may be best to use the Classics and Vintage area of the forum for discussions on these types of bikes. If we do notice there is a big increase in people talking about these bikes consistently, we would definitely be looking to add a forum for it. Perhaps you could start a poll and see how many people have those types of bikes or are interested in talking about those types of bikes? If we can see enough interest generated, there would be an obvious need to add that new forum into the fold.