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Both my Truss type scopes are alum poled. Serrurier design tries to balance any deflection. Biggest issue was I needed to stiffen my UTA assembly. Trying or too much weight reduction.
Buying the 8" f4 is a good idea. Probably cheapest way to get all the components required. I am unsure as to how much weight you might save and solid tube OTA's are very stiff and stable but if the plan is to test build capability then why not.
As I said before, willing to assist.
P.S. : Are you a member of Auckland Astronomical Society Henry ?
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