Hers a quick video.
Those look good. Little concavity too. The grooves dont need to be even that clean and straight if you use the method of filling grooves with glue.
Thanks Jere. I did my first few thin sizing coats last night. Still got a number of them to do yet. I did a dry fit on both and grooves seem to fit nice and tight. Phew! It was a test for my ocd to get this good and straight and have these grooves line up. I think I’m gonna partially fill the grooves with glue upon glue up. As far as number of size coats I gather it will be around 10-12 coats or until shiny. My hope is that by doing it this way it will fill any imperfections unseen in the grooves. Here’s a few pics. Lots shavings!
I got my grooving all sized coated and ready last night. I then glued up the horn slats to the cores of both bows. I used the yumi rope and wedges method for both. I was considering doing one with tencik but the first o e went so well that I decided to do the other the same. It will be a good test either way of this method. I’ve seen one other instance where this method was used for horn bows that were not yumi bows. I was intrigued by the process so figured I’d try it. I got the grooves to line up good I think and got good squeeze out. I put lots of glue on there to ensure if any gaps were at least filled with glue. A dry run before went good and figment was nice and solid so here’s hoping I didn’t screw it up! lol. I’ll post a video link here but please feel free to fast forward thru boring parts. I could figure out how to fast forward thru bits of it to shorten it up. Oh well. You guys will get the idea. Let me know what you think!
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Very nice complete demonstration of this process.Thanks for showing it.
The overall process time was’nt all that long yet.
Ok so I got these off the forms and all looks great! What a relief! Everything looks lined up good and grooving aligned too. My biggest worry was the possibility of cross threading after all that effort to do matching grooves. Would have been a shame. I feel confident moving forward now and will start thinning the core and horn a bit more.
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That was a good video, thanks! This method seems to suit well for longer bows, yumi example of course. With rope and tencik it would be slow and maybe less manageable when multiple laminations are used?
I do quite a number of things differently than you here, so its definitely interesting to see other methods. Sometimes we find out we overcomplicate things so its always useful to learn something new. 
Thanks for your comments. Ya it’s a fair amount of experimenting going on here. I’ve read Adam’s book and know that these particular bows are breaking some of the rules or conventional wisdom. I have some theories on what may happen and the performance benefits that may be had if they survive. If at very least I’ve learned a lot on the build process and explored a new horn glue up method.