Is there some reason you need the split top or knockdown version? If all you want is a batten for a planing stop, there other ways to do that. One way is a batten and holdfast, like in the video. https://www.youtube.com/watch?v=WNrof3cd1cA Another way is a planing stop. All you need is dog holes. you can make your own or buy them from Lee Valley. http://www.leevalley.com/US/Wood/page.aspx?p=69837&cat=1,41637 I made the knockdown bench and I use both ways. I prefer the holdfast and batten, like in the video.
Those are good suggestions. I was mostly thinking that the way Mike Siemsen uses the long batten that slips inside the gap on the split top looks pretty useful. Especially for planing across the benchtop when traversing a board etc. The planing stops from Lee Valley seem to accomplish the same thing. I may make something like that that can slip into some dog holes. Thanks!
You can do that with a top of any thickness, just add register pins which span from one board to the other. If they are all the same length and longer than the combined depth of each pair of holes, it'll give you a split top without having to use bearers. They'll need to be longish and you'll need to have a few, as they'll be subject to shear loading from the weight of the top and its imposed load. 1" riven White Oak pegs without a huge gap between the two top parts would be a possibility. For an idea....... [IMG_1931](//muut.com/u/lostartpress/s3/:lostartpress:3bEM:img_1931.jpg.jpg)
Another great suggestion. This would actually give me a split top. Thank you!