Print your own roman-style cathedrale.

Best start with one arc and see if it holds together well. (A roman arch should hold together by its own wiegth, as long as lateral forces aren't to great.)
You'll need to print out one scavold to assemble the arc(s) on.

You can edit the size of the arc and the number of stones for one arc in the OpenSCAD-file.

Let me know if you need more stl's.

Virtuale walk-around:

www.youtube.com/watch?v=2_VJvKemddQ&feature=youtu.be

When I made the corner pieces for the arc, I found that 15 pie-shaped pieces per arc made the corners look much nicer.

The ancestor of this ( www.thingiverse.com/image:151424 ) has 17 pieces per arc.

I added the number 15 to all files that were made for 15-piece arches.

I used the animation feature of OpenSCAD to create a 'walk-around'.
Watch it on youtube:

www.youtube.com/watch?v=2_VJvKemddQ&feature=youtu.be

The music is electroviolon by Tictac, from www.jamendo.com .
The animation shows a cathedrale with 5 times 7 arches.

There is a zip-file that contains all the .scad, pictures and .stl's.

Enjoy!