I'm no engineer, but the lack of triangulation looks like you would receive the shock up the jacksie in very short order!

The 'spacer' is...... questionable.
Doesn't appear to be any weld running lateraly along the top of the tube, just down the sides!

However, if lasts the race and falls apart crossing the line in 1st place, a racing man would say it was "Good enough"!

I hope you figure something out Steve.
My regards, Bill.