If your building a workbench for the shop, I probably wouldn’t worry about the paint. After it’s built, if you wanted to paint the workbench a different color, you can always scuff sand it and paint it.
The P C jig saw looks fine. I prefer the Bosch personally but the price point is higher.
As for free hand routing, it is very hard to control 1/2” cut. You have more control when you cut narrow and shallow and less control when you go deep and widen.
If you don't have time to do it right the first time, when will you have time to do it over?