CO-LP Detector Mount for Vanagon T3 T25 Westphalia

I removed the rear heater in my Vanagon camper and installed a CO-LP Detector.
https://www.amazon.com/gp/product/B005GSFTSE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
This mounts where the grille for the rear heater used to be. The back cover protects it from things stored under the bench.
I used ABS. I have found that Fusion Matte Coffee Bean spray paint is close to the brown in Vanagons.