That set up looks pretty good! The RTX 2060 in particular is a great card.. not overboard by any means. However comfortable you are with paying slightly more for performance will definitely make it up in boosting your speed. We’ve never found that to be an issue.
If you want to compare to what we’re running here, check out this link: http://sketchupforprofessionals.com/myrig/
Your custom computer will run SketchUp no problem!