Position of the lower arm looks good so far, Ryan. That crossmember looks weak, going to take some good reinforcement and gusseting to make it work right! Just keep that upper arm centered in it's range of travel on the slots! Did you put an angle finder or caster/camber gauge (preferred) on the spindle to get the 5 to 7 degrees cranked into it?

I would also suggest some gussets from the crossmember to the frame as well as from the lower shaft tube to the crossmember. With the proper structuring and some good welds, it should do fine, Ryan....