Pierrel - coming up with a good fastening method can be the tricky part, especially if you want to be able to easily remove the parts (even trickier if you want to be able to remove them without using tools).
Today: progressed to the cosmetic part of the project, at least for the upper section. Maybe some pics tomorrow if I get to the first coat of primer. I hate this part of the job, which is basically the application of expensive chemicals, 90% of which I end up sanding off anyway! I brushed on a "base" coat of epoxy, so up next: sand, putty, sand, paint, sand, putty, sand, paint...
I also made the template for the bottom block as well.
And, I've come up with a plan to make a relatively simple variable shutter for the bottom opening, so I'll have the option of going with a 100% block at times - eg. during warm-up, or very cold temps, long downhill coasts, etc.
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