Level Editor "Locking" question

[MrBigzy]

Use the position and scaling boxes on the right to do minor adjustments to make the welders cover stuff properly. Just try not to scale too much; the texture scales with it unless it's a plane. And of course the walls won't go together well, they're different types of walls!
Tip for people who might not know: extension walls are used to place on top of the normal walls, to make them taller.