Today was very productive! I started with the right forward strut attachments, completing the bend and the through-hole on the aft plate. Then I slid everything half-outside the garage and worked on the left to get it up to the same spot.
As with all the 1/4" attach points, I keep them as 3/16" holes until everything is held in place together and can be match-drilled to the full 1/4" diameter. This might be overkill since it needs to be a sloppy 1/4" for a slip-fit pin insertion, but it feels better to do it this way. The final match-drill is so much more satisfying knowing there is no slop.
This is the right strut attach point with a first look at the new cabane attachment. It's not exactly done yet. For starters, the connection is just a tab that the strut pin goes through, which could slip off the end of the quick-pin if the bungees broke. Much better to have two tabs so the pin has to fall out all on its own. I'm still thinking...
I did shorten the main cabane tube by about a half-inch. That was a definite committal moment. But you know, reworking this joint is maybe a good way to show how forgiving the "boltalicious" Goat construction is. Need to make a change after it's all built? Just unbolt, make a new whatever, and bolt it back in. Pretty awesome. No welding or re-riveting needed.
One consequence of attaching the cabanes along with the strut quick-pin is they are pinched in closer to the center-line than on the original Goat designs. This means the cabanes pinch and interfere with the seat-back, which is now too wide. I could lean the seat forward a bit (which is what I did for now), or narrow the upper seat tube.
Finally, here is how I spent most of the day, with Goat hanging half-way in the garage and half-way out. The forward struts are simply taped on the leading edge as a mock-up, but it was enough to make some measurements and sort out the lengths needed for setting the dihedral angle.
Oh also, the forward sweep cables really do make a big difference in holding the leading edge in place ... right at head-height in this orientation :-)