That is a pretty good start. longest and shallowest lines to the outside and then progressively shorter and deeper, riggers being the shortest and deepest of the spread, thus creating a "V" with all your lines. that way you can get the fish to the back of the boat without tangling with all the other lines. Keep a lot of releases onboard so you can just let them fall to the board after a hit. That will save you having to reel in the big boards to get another release. I find if you are only running a couple of rods the inlines are less hassle however with 6 or more rods in the water the big boards can be quite helpful.
Matt