It's surprisingly difficult to find small amounts of rectangular aluminum tubing...

A few weeks ago I needed to re-build a fence for a table saw. I had to track down some rectangular aluminum tubing. Unfortunately the only place I found would sell it in 20 ft lengths, and I only needed 1.5 feet or so.

Instead, I went to Princess Auto (picture: Canada's Harbor Freight), got a 4 foot piece of steel tubing instead. I had to do a bunch more grinding, but it seems to have mostly worked.

I've been thinking it would be cool to eventually build my own locost with an aluminum frame. At least now I know where to get the aluminum tubing. I do wonder though, how well would aluminum hold up compared to steel? I'd be a bit more worried about stress fractures and the like.

Thoughts?