I had to wedge mine outward with a stick like this to drill the aft edges, and will / may to do so again to get it riveted on when the time comes, but the clecos hold it in near-perfect alignment with the skins, as will the rivets, and I will make up the difference with micro and sandpaper

It's a springy piece of composite, and not perfectly molded. But so far it's been kinda fun to work on.
__________________
Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug