How to draw proper polygons in Pixly?

[dom.stephen]

I'm stumped in this. I can't find a way to draw an apse for this.
Help?

EDIT: I'm following this plan here. If there's no other way I'll just switch to something else.

[-LeoLeo-]

Hi.

Well... Pixly does have some "basic" shapes, like cubes and ovals, but something that complex? You probably have to draw it by yourself.

Though! Pixly does have an overlay feature.
So if you have a isometric picture of the building (from Google Earth?), you can use that as a guide.