I've wondered about this same thing, although my impulse would be to go with titanium tubes and stainless lugs.

I'm years from having any free time to try it (three small children), and so never asked the question, but I am intrigued.

Two issues:

- I thought I saw a post here saying that conventional lugs weren't deep enough for epoxy. There are listed strengths for epoxies, but I don't know how to compare to the strength of a braze.

- Surface prep is apparently critical in epoxying to metal, depending on the metal. More critical for aluminum, less for steel (assuming de-greasing, at least), medium for titanium. So, you might need to acid etch the areas to be joined shortly before bonding. See google books "Surface Treatment of materials for adhesion bonding"