The aileron with it’s counter sunk hinge slots.

Next pic is the dry fit, note, it does actually fit better than it looks in this pic as the wing trailing edge hasn’t been cut down to size yet.

One thing it did highlight though is that due to the sweep of the aileron you can't just push the hinges in as the inboard bit of the wing is in the way. I’ll have a read of the instructions to see if Mick suggests how to over come this problem, if not then the preferred option at the moment seems to be to leave 1/8” gap then slot the aileron in at 90 deg (ie full deflection plus some more) and it will just about go. Then fill the 1/8” gap after aileron is is in place.

…I’ll have a think about it, there must be a better way, but I’m open to ideas.