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Hi Michael,
If those octagonal shapes become the aperture stop your stars will have 8 horrible spikes radiating from them, and images of jupiter/saturn will be rather awful.
To be effective the baffles must create a circular aperture - not octagonal.
Best way to do that is to make the baffles out of something thin - 1mm aircraft ply for example, with the hole accurately cut using router with a jig or template to make a smooth perfect circle. Then glue these against those octagonal balsa strips.
The other thing is several 1-piece baffles from material like aircraft ply will substantially strength your tube - looking at it, it appears (a) quite heavy and (b) any localised stress such as where it attached to the mount is likely to break the glued joints.
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