wow that looks great! It's really coming along! As for your question about the lower shock mounts, mounting the bottom of the shocks on the 4 link is only really used if you have a very tall chassis, tiny shocks, or you want a very high sitting chassis with a high center of gravity. I do think, though, that attaching the shocks to the 4 link will allow greater articulation since the shocks won't be able to bind, but I'm not sure if it is a big difference.