As long as that acer is in a container, I wouldn't do a Japanese garden around it; Japanese gardens are representations of nature and Mother doesn't plant in pots
Please read through the Helpful Gardener [url=https://www.helpfulgardener.com/japanese/index.html]Japanese Garden[/url] pages for an oversight on the style; it is too broad a subject to go into here. Here is a link to a great site for viewing the best gardens of Japan; coupled with a little better understanding of the style from my articles, I think you may get some great ideas...
In the meantime, one of the nicest Japanese gardens I saw was a little doorstep garden in Mike Yamashita's "In the Japanese Garden". It was a maple next to a single boulder (really just a big wallstone), with a shallow basin buried in front of it and filled with water. Incredibly simple, yet it has the plants, rock, and water that constitute most Japanese gardens. SO if you do something in the meantime, less is more...