I would just hire Eric! 
Impressive stuff.
But seriously, I don’t know how to do what you need done, BUT I would suggest you get SketchUp Pro. In your case you could bill it to your client and get a freebie. You’ll need it for a thousand other reasons anyway, and it’s just the cost of doing business. I’m locking down more work in my filed of lighting design because I’ve learned to do things in SketchUp and Photoshop, and other software that my competitors cannot do, so investing in tech in both time and learning will pay off for you. Best of luck!