Today I deburred all the parts, then I assembled the left aileron to drill everything. On the picture you can see the spar, the leading edge and inside the leading edge the couterweight pipe. This pipe is fixed with pop rivets, I'll have to look how to use this particular type of rivets at this location.

32 stiffeners cut and drilled, they are now ready for deburring and dimpling. Some work also on the spar.

All the parts are accounted for, plan reading, and begin of stiffener work.