I think it will be easier to adjust the wheel fairings with the engine off the fuselage. The fairings have to be aligned with the fuselage in the flying attitude and the wheels not touching the floor, this will be easier to do without the weight of the engine.
But first I fabricate to small dollies to put under the main wheels to be able to move the fuselage sideways in the workshop.



Then I assemble the two halves of the front wheel fairing. A few spots need some sanding but this should ne be a problem.



Then I assemble the main wheel fairings, looks not too bad.



Here is a picture of where both halves meet, I have a few 1/16" gaps.



Then I verified that leg fairngs where not twisted using two squares.



The template on the plan will be used to cut the fairing to the correct size.