50adrod,
I think you will find the ones with the toeboards attached much easier to use and you eliminate a tough joint to fit and weld.
I would recommend only working one side at a time with the cab on or off as they do move some. You will want to reinstall the door before you fit the outer cowl panel so you get the spacing correct. One additional note of caution none of the panels are exact fits they all require trimming and careful fitting to make them work. Here is my album if you want to see how mine is coming. My other panels are in the mail for the R.S. so I will be updating soon.
http://community.webshots.com/user/RugerWSM?vhost=community 
