Moments of shame - häpeän hetket ;)
(This page is dedicated for my mistakes)

• Stabilizer tip rib riveted on wrong side of main spar. This made a 4 mm cap between nose tip and stabilizer skin. It also increased elevator length 4,5 mm. Cap filled with LPS strong aluminium filler. At center of elevator skin is contact with tip ribs.
• Measured and cutted TWO times wrongly elevator skin. Costs were about 200 € !
• A 3 mm cap found again between elevator tip rib and skin after. Filled again with LPS alumium filler. I asked help from ZAC and Nick answered:

"Filling the gap with a filler is acceptable.

For the install of the elevator to the stablizer, please refer to the
bottom left diagram on drawing 7-H-3. Please check that you have
110mm from the hinge line to the leading edge of the elevator. On the
same drawing, note that it shows 117mm from the hinge line to the
back
side of the stabilizer spar.

Nick Heintz
Zenith Aircraft Company