Rather than continue to hijack Joe's build thread I thought it best to post a separate question.

DC posted a link for a build where the guy had used an epoxy adhesive to build a steel frame rather than by welding. Having just read some of the latest posts an L shaped gantry seems to be favored by a few people & I wondered if building an L shaped gantry using aluminium box section rather than the extruded profile section would work if constructed this way.