elevations and 3D missing rim joist

[signahome]

the 3d and elevations are missing the rim joist how do i fix

[DBCooper]

I don't think you actually want to see the rim joist because the siding should be dropping down to cover it. 

 

So things I would look at would be to see if your walls are set the default heights (you should not need to manually change wall heights except for special situations) or if you have done anything goofy in your floor structure.  An easy way to reset your wall heights is to use the "reset to defaults" tool.  If this doesn't help, then you should probably post your plan.