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Hi Rolf,
That truss design is brilliant for imaging (what the heck became of "photography"). It is incredibly strong and stable.
With the picture you given the link to, nuts & bolts is fine. It will be most forgiving if the OTA needs to be altered- no welds to cut.
The central brace should be welded for optimal strength. The welding can either be done by a dedicated welder, but you can also get a decent weld done by many ship wrights or other boating repairers as they regularly need to repair aluminium.
The good thing about a strong welded central brace is that it can best deal with the flexural forces. It will also provide the most secure platform to secure the OTA to the mount.
It shouldn't be that expensive either. You can also make some welding jigs for the joints to be welded. That makes the accuracy your responsability. I'd rather that fall on my shoulders than get crook with someone else about it. I can give you some ideas on how to make these if you like through PMs or email as it is beyond the scope of this thread. Other fellows here on IIS have incredible experience with welding. Just ask.
Clever desiging can give you a rotating secondary cage too for optimal visual access.
Nothing like making your own.
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