Ok, you right perhaps do it after covring is a cleaner job...
But make it before covering was also better because was still possible to do some modifications to the line of the tristock trailing edge for prfect fit the parts, or so. When the pieces are covered nothing more can be done......

Anyway mine real problem is another one:
I am finishing the beautiful Mojo 60, but I have not well calculated the dimensions of the plane.. and now I am sure of it:
IT WILL NOT FIT IM MY CAR!!!!!!!!!![]
What can I do??????[&o]