Lots of folks will make sure they run power up to the new panel/box and then run from there to the various accessories.....or ....put in a new fuse panel/box back on the firewall behind the seat next to the original.....The original doesn't have many slots left over so having another for the lights, pumps, radios, ....stuff helps out when it comes to fuses/breakers...........
For me, I truly dislike it to see wires just running hodgepodge and spaghetti like so running them inside some of that split plastic conduit stuff really is great and then zip-tie that to the roll bar tubing on the way to the back or wherever. That's one of the things I truly like about the older RTVs with all the open room and tubing to attach gun racks, radios, lights....stuff........
Make sure you use shrink tubing to join connections and solder them when you can. Lots of vibrations and jolts happen out there and it's good to KNOW that things work when you need them..........Good luck......Dennis