Attaching a linear_sweep to a prismoid

[ianatha]

1. I have a prismoid
2. I also have a linear_sweep(region=offset_stroke(path_here))
3. I'd like the second object to be aligned to the center+bottom edge of the prismoid, angled according to the face of the prismoid.

For example, I'd like to end up with something like this:

How do I achieve that?

I have gotten to:

include <BOSL2/std.scad>;
include <BOSL2/rounding.scad>;

path=[
    [0,-4],
    [4,0],
    [0, 4],
    [0, 0]
];

prismoid(
    size1=[10, 10],
    size2=[40, 40],
    height=50
) {
    attach(FRONT+BOTTOM+CENTER)
    linear_sweep(
        height=5,
        region=offset_stroke(
            path,
            width = 2,
        )
    );
}

but I end up with:

My apologies if I'm asking for something trite, and thank you for your any help/pointers you may have.

[adrianVmariano]

Something like this:

path=zrot(-45,[
    [0,-4],
    [4,0],
    [0, 4],
    [0, 0]
]);

prismoid(
    size1=[10, 10],
    size2=[40, 40],
    height=50
) {
    attach(FRONT,BOT,align=BOT)
    linear_sweep(
        height=5,
        region=offset_stroke(
            path,
            width = 2,
        )
    );
}