The best recommendation I can give you on the tower is to take the extra few moments to get the strut end angles correct.
It's a fine line here - you want a slight friction fit between the two outside (thicker) legs but not so tight to cause them to bow out.
You should use waxed paper under the glued dowels. I took this picture without it for clarity.
I didn't find it necessary to pin the "Z" shape in the middle, that slight friction fit was enough to keep them in place. The lower, shorter struts will take pins to keep them against the bottom of the "Z".
Here's the lower "V" struts pinned and glued. Lots of pins here! As mentioned before, the "V" tips are cut off after drying.
I don't use a heavy glue blob over all the strut joints. I'll apply a small drop and wipe off the excess. This pushes glue into the joint and around the joint closing up any cracks. To do it right, you'll have to apply glue a few times because it will shrink.
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