Bracket between fuel cells calls for 10-32 bolt. I did not see them, so I bought two stainless steel hexcap 1/4" -20 x 3" bolts.
Mounted cabin and Betsy drilled the nose gear holes and slots.
Betsy and I cut the shoulder belt holes in back of cabin. (Not sure if we got them high enough because we did not have the seat slide hardware installed at the time.