Nice try, congratulations!
But... I wonder if the ghosting effect you got in the rendering would be due to the fact that you didn't change the color of both sides of the wall you exported.
I don't get this effect in the example I posted...
Hmm right I only colored one side. I should test that out using the test room I made. The bad thing is even with my walls 1/8” thick would it cast a shadow on the floor even though being set to transparent?
Oh well, at least I used some SVG and learned something new because I was so curious how the 3-sided door frames did their magic with no threshold bottom side. Custom partial arcs at the top are tricky to figure out.