profile p x 5 y 1 x -4 y 4 x -1 y -5
prism pr p 0 0 1
vertex v3 1 5 0.3
vertex v2 5 5 0.3
vertex v1 5 1 0.3
edge e1 v1 v2
edge e2 v2 v3
wire w e1 e2
plane pl 1 5 0.3 0 0 1
featlf pr w pl 0 0 0.3 0 0 -0.3 1 1
featperform lf result

checkprops result -s 70