[AdamHeard]

There is a plug in the end of each tube that is bolted into the perpendicular frame member.

We've been doing the hole pattern for a while now, the jig is primarily for odd jobs, nothing beats the manual mill for speed. Working quickly, its about 5 minutes per foot, and that's with center drilling.

The buttonheads are only there pending arrival of longer rivets.

More pictures will be up after assembly.