We removed the bottom and side skins and did some additional minor timming and deburred everything. While the bottom skin was off we drilled the holes for the landing gear bolts where we had previously marked. I slowly upsized the drill bit so there wouldn't be a chance of the hole getting off-center. After this was completed we riveted the pieces in place. This took extra time as there were lots of different rivet call-outs. We ended up marking every hole with its call-out.