infty = 200;
eps = 0.01;

wall = 1.2;
base_w = 4;
thin_wall = 0.6;
body_h = 4;

module tbar() {
	translate([-infty/4, 0, 0]) {
		cube([infty/2, base_w, thin_wall]);
		cube([infty/2, thin_wall, body_h]);
		hull() {
			translate([0, 0.7*base_w, 0])
				cube([infty/2, thin_wall, eps]);
			translate([0, 0, body_h-eps])
				cube([infty/2, thin_wall, eps]);
		}
	}
}

module side_cube() {
	translate([-infty/2, 0, -eps])
		cube([infty, infty, body_h+2*eps]);
}

module left_side(w, h) {
	for (i=[0:$children]) {
		translate([w/2, 0, 0])
		rotate([0, 0, 90+atan(w/(2*h))])
		translate([infty/5, 0, 0])
			child(i);
	}
}

module triangle(w, h) {
	intersection() {
		union() {
			tbar();
			left_side(w, h) tbar();
			scale([-1, 1, 1]) left_side(w, h) tbar();
		}
			side_cube();
			left_side(w, h) side_cube();
			scale([-1, 1, 1]) left_side(w, h) side_cube();
	}
}

triangle(50, 80);
translate([50, 0, 0])
triangle(40, 70);
translate([85, 0, 0])
triangle(15, 50);
translate([105, 0, 0])
triangle(15, 70);