This is the point in the build where you make the transition from kit assembler to builder.
Vanís cannot foresee all the various permutation of how builders will configure their projects. Look at what other people did, decide what you like, modify if/as needed, then make some decisions.
For the side, I used rubber grommets on the side wall lighting holes for conduit runs, three on each side, one one each side for the associated wing, two on each side going aft. I ended up with one unused condition the right side - so something to have if I do a mod down the road. Stein has a nice selection of grommets: https://www.steinair.com/product-cat...ment/grommets/
For running wires forward, you will quickly run out of room on the left side where Vanís says to run wires. Run on both sides.