I'm about 1/4 the way through this build

, but the issue is that the arch looks sooo stupid because theres no arches that are 1x20, so I have to make do with using sort of a reverse staircase of bricks and try to assemble something that I would never post of the forums because its so UGLY -.-. So any hints or tips on how I could continue? Also if you'd like to take over the build I'd gladly give you the file.
And no I'm not a communist