Turn the cabin upside down to do the bottom skin and landing gear. After talking with Mike at Bushcaddy, he suggest me to begin with the landing gear brackets. It is easier to align those brakets with the bottom frame when the skins are not installed. Because my brackets where predrilled 1/8, I decided to drill the AN5 holes and mount the landing gear. Positionned all that on the bottom frame, align and drilled the frame. It came out perfect. I'm now ready for the skins.