As mentioned before, the top bolt for the UHM block for the latch tube was too close to the 1/8" angle leaving no room for the bolt, washer, or nut. Fabricated a 1/8" spacer to 'back' the F-605 bulkhead and provide a flat surface. This was done on both R & L sides.
As seen in #3, the interference of the latch cross cabin tube with the electric flap mounting channel was partially mitigated by adding a front side 1/8" spacer behind the UHM block. Unfortunately, the interference is not completely eliminated, and another 1/8" spacer will be added. It's better to add the spacers than re-fabricate the flap housing, again. (UPDATE - 12.1.10 - a 2nd spacer of 1/8th" UHM was added. And the AL spacer shown in #1 was rivet to the back of the bulkhead to secure it.)
Not shown but worth mention is that the seat back leans against the canopy tube, also. Only occurs with the hinged support hanging down, so I'll just put a note in the POH to not position the support that way.
