Okay tried some thing new, not new per say, having used alot of angled wall metal support or any thing that needs to be place against the walls don't line correctly.
So trying to curve deform container, basically draw the curve straight down the angled wall and then select the straight mesh and deform it via the spine so it's angled 100% and line ups.
This is basically a test to see, how I need to edit it and such, then I can use it will all other meshes I want angled down the side of the wall at that angle.
I don't however like this mesh I want some thing a lot thinner and much much less polys.Light mapping at high setting it going to be a mission.The other option it to a invisible wall inside, with a extruding a wee bit to assist with collision.
However they do fit into the scene, so will keep them, and just make the one I want.