Is there a place to purchase the 3D printed duct/spacers I see in some of these pictures? I've searched ebay, with no luck.
I would go to services and look for someone to print them. I have seen a few sites that do it but all were pretty high it could have changed since I looked it was a while back.
But with hiring someone in services I think will be lowest price. Unless you have a local maker club, a lot of big cities have maker groups that you could actually go to the person or club and one would print even cheaper.