Astrophoto - help, they want a canvas!

Hey folks,

my aunt and uncle want a canvas (presumably a decent sized one)
of the attached photo.
Given that my uncle just gave me a 16-35 f/2.8L II for graduation (I'm still in utter shock)
I'd REALLY like to nail this PP and make this canvas a 110% effort as a sweet gift.

Problems:
- As with many astro shots this one has been photoshopped a LOT to make it work.
- The color and PP of the pictured shot, as well as the CR2 and two PSD files (which I will leave in DB)
have confounded me. Two street lamps threw light on the church--one was that gosh-awful green,
the other was orange. I have fought with it and fought with it. Now it's tinged both green AND pink. :/
- The trees above the church are particularly troublesome as well.
- When I got these printed (casually at Costco--blech) for a friend, the color turned weird,
as did the contrast etc. I'm concerned about making it printer profile ready.
- I don't know who makes the best canvases. Adorama?

The original RAW file and two PSD files I worked up are in dropbox for your perusal.
There was masking, curves, layers, special milky way techniques and a whole host of techniques that
I misemployed for this. This was one of my first first astro shots and I didn't know what I was doing.
But they like it.

DB: 7475.CR2 original, and a few PSDs of my latest efforts.
https://www.dropbox.co​m …FKqNmNlj4z65x9W​LToua?dl=0

The shot below is the version he's seen. Any and all comments or tips are welcome.
Thank you!!!

IMAGE LINK: https://flic.kr/p/oLue​AJ

In all honesty, this would be better printed on a photographic paper in preference to a canvas.

If you could find a highly glossy canvas & have it finished with a high gloss varnish prior to stretching, it may come out ok.

You will also loose a bit of the fine detail (namely the pin-points of starlight) printing on canvas.

Have you proofed the image with the printers icc profile for canvas? that will give you a fairly good idea of how much more a canvas print would look compared to say a glossy photographic or metallic paper.