I will use a box and I will convert it to editable poly, then I will align it along my wing on reference.

我会用一个框，我会将其转换为可编辑多边形，然后我将沿着我的对齐参考翼它。

youdao

After extruding convert the object to Editable Poly or apply Edit Poly modifier to make bottom of the wall fluently become a floor.

然后将其转化成可编辑多边形或者添加编辑多边形修改器，让墙壁的底部变成地板。

youdao