I know everyone has their method, but I highly advise against welding on the suspension brackets after the housing ends have already been installed.
At minimal an alignment bar and applicable fixture blocks/pucks should be used while welding the suspension brackets. This will keep movement to a minimum at the housing end.
Ideally, the suspension brackets would be welded on first, then the housing ends for a perfect installation.
Hope this is helpful in addition to the above nice write-up.