Thanks for the tips guys.

Epoxy is pretty much out of the question for me. Kinda hard to find
things like that out here in Denver. Its gonna hafta be machine
screws... that's what I have on hand. The table saw is also packed away
right now.... grumble... grrrr.

I'd use better tubing and just braze everything, but my MAPP gas torch
just isn't hot enuf. Already tried it.

I am going to use another EMT tube running from the bike's down-tube to
the wheel as a brace. This setup is similar to the way old delivery
bikes were made. Most of the replica Wright test-bikes that I've seen
use pannier-style struts attached to the front fork and handlebars. But
this would introduce a lot of lateral motion into the experiment wheel
as the bike is ridden. I'm guessing that the Wright boys knew that and
used a frame-mounted setup.