Looking on advice on how to print this case

I would love to print this case for my Sofle v2 keyboard. Since I don't own a 3D printer (... yet) I would like to do this by using an online printing service like PCBWay. Before I order, I do have some questions, since I have never printed anything.

• What percentage of infill do you folks suggest? I was thinking 100% would be most stable.
• Would PLA be a good material? I was thinking on filling and sanding it.
• the project only has the parts for one side. Is there an easy way to mirror everything ?
• Do you guys know a good printing service in Tokyo?

If this is the wrong community please feel free to delete this post.